Bone conductive sound generating device

ABSTRACT

A bone conductive sound generating device is provided and includes a sound generating mechanism and a fixing mechanism. The fixing mechanism is configured to act on the sound generating mechanism, such that the sound generating mechanism adheres to and fit with a back of an auricle of a user at least when the sound generating mechanism is in use. Accordingly, the present application may improve the sound quality of the bone conductive sound generating device, improving listening experience for the user.

CROSS REFERENCE TO RELATED APPLICATIONS

The present application is a continuation-application of International(PCT) Patent Application No. PCT/CN2018/102360 filed on Aug. 24, 2018,which claims foreign priority of Chinese Patent Application No.201810017175.1, filed on Jan. 8, 2018 in the National IntellectualProperty Administration of China, the entire contents of which arehereby incorporated by reference in its entirety.

TECHNICAL FIELD

The present disclosure relates to the field of earphones, and moreparticularly, a bone conductive sound generating device.

BACKGROUND

Generally, sound may transmit into an ear in two ways, through airconduction and through bone conduction.

In the way of bone conduction, a bone conductive vibrating speaker maytransfer an electrical audio signal into a mechanical vibration signal,and the mechanical vibration signal may be conducted into a cochleathrough biological tissues or bones, such that a user of the speaker mayhear the sound. Compared to a conventional way of sound transmission inwhich a sound wave is generated by a diaphragm, many procedures of soundconduction may be omitted when the sound wave transmits through bones.An original sound may be restored clearly in noisy environment, and thesound wave may not affect other people due to being diffused in the air.

However, during a long-term study, the applicant of the presentdisclosure discovers that a bone conduction speaker of a conventionalbone conductive sound generating device may be adhered to a mastoid(such as a bone conductive hearing aid), a front end of a tragus (suchas a bone conduction stereo earphone), other positions of a skull (suchas a bone conduction communication helmet), and the like. A boneconductive path of the sound of the above-mentioned devices may be thesound/vibration being conducted through a skin and subcutaneous tissuesto the bones, and further being conducted through the bones to thecochlea, such that a sense of bone conduction hearing may be generated.In such a way, a frequency bandwidth of the sound/vibration conductedthrough bones may be reduced, resulting a poor quality of the sound, anda user may have an unideal listening experience.

SUMMARY OF THE DISCLOSURE

According to a first aspect of the present disclosure, a bone conductivesound generating device is provided and includes: a fixing mechanism, afirst bone conductive speaker mechanism, and a first connection member.The fixing mechanism includes a rim, a first arm, and a second arm. Thefirst arm and the second arm are connected to two opposite sides of therim. The first bone conductive speaker mechanism is connected to an endof the first arm away from the rim. The first connection member isconfigured to connect the first bone conductive speaker mechanism to thefirst arm, such that the first bone conductive speaker mechanism iscapable of moving from a first fixed position relative to the first armto a second fixed position relative to the first arm through the firstconnection member. When the first bone conductive speaker mechanism isin the first fixed position relative to the first arm, a first angle isdefined between the first bone conductive speaker mechanism and thefirst arm. When the first bone conductive speaker mechanism is in thesecond fixed position relative to the first arm, a second angle isdefined between the first bone conductive speaker mechanism and thefirst arm. The first angle is less than the second angle.

According to a second aspect of the present disclosure, a head-mountedearphone is provided and includes: a frame, a first speaker assembly, asecond speaker assembly, a first hinge, and a second hinge. The frameincludes a rim, a first arm, a second arm, and a rotational assembly.The rotational assembly is configured to connect the first arm and thesecond arm to two opposite ends of the rim. The first speaker assemblyincludes a first connection member and a first speaker mechanismconnected with each other. The second speaker assembly includes a secondconnection member and a second speaker mechanism connected with eachother. The first hinge is configured to connect an end of the firstconnection member away from the first speaker mechanism to an end of thefirst arm away from the rim. The second hinge is configured to connectan end of the second connection member away from the second speakermechanism to an end of the second arm away from the rim. A distancebetween the end of the first connection member away from the firstspeaker mechanism and the end of the first arm away from the rim isadjustable via the first hinge. When the first hinge is in a firststate, the first speaker mechanism is in a first fixed position relativeto the first arm, and a first distance is defined between the end of thefirst connection member away from the first speaker mechanism and theend of the first arm away from the rim. When the first hinge is in asecond state, the first speaker mechanism is in a second fixed positionrelative to the first arm, and a second distance is defined between theend of the first connection member away from the first speaker mechanismand the end of the first arm away from the rim, wherein the firstdistance is less than the second distance.

According to a third aspect of the present disclosure, a bone conductivespeaker assembly is provided and includes a connection member and a boneconductive speaker mechanism. An end of the connection member isconnected to the bone conductive speaker mechanism, and the other end ofthe connection member is capable of being electrically connected to anend of an arm of eyeglasses. The bone conductive speaker mechanism has aprotruded curved face, and the protruded curved face is capable ofadhering to and fitting with a predefined region of a back of an auricleof an ear. A center of the predefined region directly faces a crus ofhelix of the ear.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram of a pathway of a sound/vibration being conductedthrough bones in a related art.

FIG. 2 shows an amplitude-frequency curve of the sound/vibrationpropagation through a skin and subcutaneous tissues and anamplitude-frequency curve of the sound/vibration propagation without theskin and subcutaneous tissues.

FIG. 3 shows an amplitude-frequency curve of the sound/vibrationpropagation through bones and an amplitude-frequency curve of thesound/vibration propagation through cartilage.

FIG. 4 is a structural schematic view of a bone conductive soundgenerating device according to an embodiment of the present disclosure.

FIG. 5 is a diagram of a path the sound/vibration being conductedthrough bones according to an embodiment of the present disclosure.

FIG. 6 shows an amplitude-frequency curve of sound/vibration propagationof a conventional sound generating device when the conventional soundgenerating device being adhered to a user in a conventional way and anamplitude-frequency curve of sound/vibration propagation of a soundgenerating device of the present disclosure when the sound generatingdevice of the present disclosure being adhered to an auricle of theuser.

FIG. 7 is an anatomic view of an ear of a human.

FIG. 8 is a cross-sectional view of the ear shown in FIG. 7, taken alonga line VIII-VIII.

FIG. 9 is a structural schematic view of a bone conductive soundgenerating device according to an embodiment of the present disclosure.

FIG. 10 is a structural schematic view of a bone conductive speakermechanism of a bone conductive sound generating device according to anembodiment of the present disclosure.

FIG. 11 is a schematic view of a pressure test of a bone conductivespeaker mechanism of a bone conductive sound generating device onto anauricle according to an embodiment of the present disclosure.

FIG. 12 is a side view of a bone conductive speaker mechanism accordingto an embodiment of the present disclosure.

FIG. 13 is another side view of a bone conductive speaker mechanismaccording to an embodiment of the present disclosure.

FIG. 14 is a rear view of a bone conductive sound generating deviceaccording to an embodiment of the present disclosure.

FIG. 15 is a schematic view of a bone conductive sound generating deviceaccording to an embodiment of the present disclosure.

FIG. 16 is a schematic view showing distances between relative elementsof bone conduction glasses according to an embodiment of the presentdisclosure.

FIG. 17 is a cross-sectional view of a portion of a bone conductivesound generating device according to an embodiment of the presentdisclosure.

FIG. 18 is an enlarged structural schematic view of a portion A shown inFIG. 17.

FIG. 19 is a structural schematic view of a rotation shaft assembly anda connection thread of a bone conductive sound generating deviceaccording to an embodiment of the present disclosure.

FIG. 20 is a structural schematic view of a first rotation shaft of abone conductive sound generating device according to an embodiment ofthe present disclosure.

FIG. 21 is an exploded perspective view of a portion of a boneconductive sound generating device according to an embodiment of thepresent disclosure.

FIG. 22 is a structural schematic view of a frame and a lens ofeyeglasses of a bone conductive sound generating device according to anembodiment of the present disclosure.

FIG. 23 is a structural schematic view of a portion of an arm ofeyeglasses of a bone conductive sound generating device according to anembodiment of the present disclosure.

FIG. 24 is a structural schematic view of a portion of a bone conductivesound generating device according to an embodiment of the presentdisclosure.

FIG. 25 is an exploded perspective view of a portion of a boneconductive sound generating device according to an embodiment of thepresent disclosure.

FIG. 26 is a cross-sectional view of the bone conductive soundgenerating device shown in FIG. 24, taken along a line B-B.

FIG. 27 is a structural schematic view of a portion of a bone conductivesound generating device according to an embodiment of the presentdisclosure.

FIG. 28 is a schematic view of an original state of a protective case ofa bone conductive sound generating device according to an embodiment ofthe present disclosure.

FIG. 29 is a cross-sectional view of a portion of a protective case inan original state of a bone conductive sound generating device accordingto an embodiment of the present disclosure.

FIG. 30 is a schematic view of a protective case of a bone conductivesound generating device in a bent state according to an embodiment ofthe present disclosure.

FIG. 31 is a cross-sectional view of a portion of a protective case of abone conductive sound generating device in a bent state according to anembodiment of the present disclosure.

FIG. 32 is a cross-sectional view of a portion of a bone conductivesound generating device according to an embodiment of the presentdisclosure.

FIG. 33 is an enlarged view of a portion B shown in FIG. 32.

FIG. 34 is an enlarged view of a portion C shown in FIG. 33.

FIG. 35 is a cross-sectional view of a portion of a bone conductivesound generating device according to an embodiment of the presentdisclosure.

FIG. 36 is an enlarged view of a portion D shown in FIG. 35.

FIG. 37 is an exploded perspective view of a portion of a boneconductive sound generating device according to an embodiment of thepresent disclosure.

DETAILED DESCRIPTION

Before illustrating various embodiments of the present disclosure,technologies in the related art will be briefly introduced.

Different from air conduction, conducting a sound/vibration throughbones may involve a solid medium or a mixture of a solid medium and aliquid medium. Properties of a conduction path may significantly affectthe quality of the sound conducted through bones. Therefore, asignificant strategy of improving the quality of the sound through boneconduction may be selecting an appropriate path for the sound to beconducted through bone and adjusting and regulating the properties ofthe conduction path.

A typical strategy may be adhering the bone conductive speaker to amastoid (such as a bone conductive hearing aid), a front end of a tragus(such as a bone conduction stereo earphone), other positions of a skull(such as a bone conduction communication helmet), and the like. A boneconduction path of the above-mentioned devices may be thesound/vibration being conducted through a skin and subcutaneous tissuesto reach the bones, and the sound/vibration being conducted through thebones to reach a cochlea, such that a sense of bone conductive hearingmay be generated. An example of conduction paths may be shown in FIG. 1.The conduction path shown in FIG. 1 may affect the quality of the soundconducted through bones in following manners. Firstly, the skin and thesubcutaneous tissues may have relatively high mechanical damping, anefficiency of conducting a high frequency sound/vibration may berelatively low, such that the high frequency of the sound conductedthrough the bone may be reduced or lost. Secondly, the bones of theconduction path may have relatively high rigidity, an efficiency ofconducting a low frequency sound/vibration may be relatively low, suchthat the low frequency of the sound conducted through the bone may bereduced or lost.

Further, an effect of the skin, the subcutaneous tissues, and therigidity of the bones on properties of a frequency domain of the soundalong the conduction path may be calculated. Firstly, as shown in FIG.2, a medium-high frequency region of an amplitude-frequency of the soundis significantly decreased due to the skin and the subcutaneous tissues,indicating that the skin and the subcutaneous tissues may reduce anefficiency of conducting the high frequency of the sound. Further, asshown in FIG. 3, as the rigidity of the bones changes, the entirefrequency range of the amplitude-frequency curve of the sound along theconduction path changes. In particular, an efficiency of conducting alow frequency sound may be significantly affected. As the rigidity ofthe bones increases, a medium-low frequency portion of the sounddecreases, indicating that the rigidity of the bones may reduce anefficiency of ducting the medium-low frequency sound.

In other words, the skin, the subcutaneous tissues, and the rigidity ofthe bones may reduce a frequency bandwidth of the sound conductedthrough the bone, such that the sound quality may be reduced, and theuser may have an unideal listening experience.

Technical solutions of embodiments of the present disclosure will beillustrated clearly and comprehensively by referring to the drawings ofthe embodiments. Obviously, the embodiments to be illustrated are only apart of, but not all of the embodiments. Based on the embodiments of thepresent disclosure, any one of skill in the related art may obtain allother embodiments without contributing creative work, and the obtainedother embodiments should be within the scope of the present disclosure.

As shown in FIG. 4, a structural schematic view of a bone conductivesound generating device according to an embodiment of the presentdisclosure is shown.

It should be noted that the bone conductive sound generating device ofthe present disclosure may be any device having a function of anearphone allowing bone conduction, such as a bone conductive earphoneand eyeglasses, a hat, a head accessory, other head-mounted engineeringsupplies, and head-mounted military supplies having functions ofgenerating the sound that can be conducted through bones, or anassistive listening device such as a hearing aid, which will not belimited by the present application.

The bone conductive sound generating device may include: a fixingmechanism 10 and a bone conductive speaker mechanism 20. The fixingmechanism 10 may be configured with the bone conductive speakermechanism 20. At least when the bone conductive speaker mechanism 20 isin use, the fixing mechanism 10 may be configured to enable the boneconductive speaker mechanism 20 to be adhered to and fit with a back ofan auricle of a user.

To be noted that, the auricle may be a part of an external ear and maysubstantially be composed of cartilage. In the present embodiment, thebone conductive speaker mechanism 20 may be adhered to and fit with theback of the auricle, such that the sound/vibration may be conductedthrough the cartilage of the auricle.

Compared to the bones, rigidity of the cartilage may be relatively low.An efficiency of the low-frequency sound/vibration conducted through thecartilage may be relatively high, the low-frequency sound may be wellconducted, reducing a loss of the low-frequency sound during conduction.Further, as the auricle is in a shape of a sector, when thesound/vibration are conducted through the bones, the auricle and othertissues connected to the auricle may generate vibration correspondingly,such that a corresponding air conductive sound may be generated. At thesame time, in an ear canal, vibration of the auricle may cause a sidewall of the ear canal to vibrate, such that air in the ear canal maygenerate high-frequency resonance. The air conductive sound may furthercompensate the loss of the low-frequency sound/vibration in a process ofbone conduction and the loss of the high-frequency sound/vibration in aprocess of the sound/vibration being conducted through the skin and thesubcutaneous tissues. In particular, when the bone conductive speaker isadhered to and fit with the auricle, the path of the sound/vibrationpropagating through the bones may be shown in FIG. 5. In other words, amedium of cartilage for conducting the sound may be included in theconduction path.

In addition, as shown in FIG. 6, a frequency domain property of thesound along the conduction path while the bone conductive speakermechanism 20 adhering to and fitting with the back of the auricle and afrequency domain property of the sound along the conduction path while abone conductive sound generating device in the related art adhering theear of the user in a conventional way may be calculated mathematically.Compared to the related art, as a process of conducting the soundthrough the auricle cartilage is included in the conduction path, themedium-low frequency sound of the amplitude-frequency curve of theconduction path may be significantly increased, indicating that adheringthe bone conductive speaker mechanism 20 to the back of the auricle ofthe user according to the present disclosure may reduce the loss of thelow frequency sound during conduction.

Further, the bone conductive speaker mechanism 20 is adhered to the backof the auricle, the sound quality may be improved, and at the same time,an effect of the bone conductive speaker mechanism 20 on the ear canalmay be reduced when the sound is being conducted. As the bone conductionmechanism 20 may be adhered to the back of the auricle, the boneconduction mechanism 20 may be hidden behind the ear and may not beshown on an appearance, meeting various demands of the user.

Alternatively, the fixing mechanism 10 may be configured with the boneconductive speaker mechanism 20, enabling the bone conductive speakermechanism 20 to be adhered to and fit with a predefined region of theback of the auricle. Further, a region of the back of the auricledirectly facing a crus of helix may be relatively flat, enabling arelatively larger area of the bone conductive speaker mechanism 20 to beadhered and fit, improving an efficiency of vibrating conduction andobtaining a higher volume of the sound. In addition, the cartilage ofthe region may be relatively thick, closer to an internal ear canal, andhaving higher tenacity. Therefore, while generating a better soundquality, an edge of the auricle may not be driven to vibrate and may notbe numb or itchy due to vibration, and the user may not haveuncomfortable feelings. Therefore, the predefined region may be theregion directly facing the crus of helix, as shown in FIGS. 7 and 8. Inparticular, the predefined region may be a region in 20 cm² having acenter directly facing the crus of helix. Alternatively, the predefinedregion may be a region in 10 cm² having a center directly facing thecrus of helix, which is a portion of the back of the auricle without thehelix. Alternatively, the predefined region may be a region in 5 cm²having a center directly facing the crus of helix, which is a region ofthe back of the auricle corresponding to a cavity of concha.

Further, the fixing mechanism 10 may be a mechanism specificallyconfigured to fix the bone conductive sound generating device. When theuser needs to use the bone conductive sound generating device, thefixing mechanism 10 may be fixedly positioned near the ear of the user,such that the bone conductive speaker mechanism 20 may be adhered to andfit with the back of the auricle. Alternatively, the fixing mechanism 10may be another device connected to the bone conductive speaker mechanism20 and having functions independent from the bone conductive speakermechanism 20. When the user is wearing the device, the user may adherethe bone conductive speaker mechanism 20 indirectly to the back of theauricle by certain means, such that when the user is using the devicefor other purposes, the bone conductive sound generating device mayprovide the sound generating function at the same time.

As shown in FIG. 4, in an application scenario, the fixing mechanism 10may be an eyeglass frame 30. The eyeglass frame 30 may include a rim 31and an arm 32. The arm 32 may include a body portion 321 connected tothe rim 31 and a connection member 322. The connection member 322 may beconnected to an end of the body portion 321 away from the rim 31 via ahinge 40. The bone conductive speaker mechanism 20 may further bearranged on the connection member 322.

In the present embodiment, the eyeglass frame 30 may be a frame ofshortsighted eyeglasses, a frame of longsighted eyeglasses, a frame ofsunglasses, a frame of 3D glasses, a frame of intelligent glasses, aframe of virtual reality glasses, a frame of hologram glasses, a frameof augmented reality glasses, and the like, which will not be limited bythe present disclosure.

Alternatively, the connection member 322 may be configured to allow thebone conductive speaker mechanism 20 and the body portion 321 to beswitched between a first fixed relative position and a second fixedrelative position arbitrarily. When the bone conductive speakermechanism 20 is at the first fixed relative position, the boneconductive speaker mechanism 20 may be adhered to and fit with the backof the auricle of the user. In particular, the first fixed relativeposition between the bone conductive speaker mechanism 20 and the bodyportion 321 may be shown in FIG. 9, and the second fixed relativeposition between the bone conductive speaker mechanism 20 and the bodyportion 321 may be shown in FIG. 4. It may be noted that, in the presentembodiment, when the bone conductive speaker mechanism 20 and the bodyportion 321 are at one of the first and the second fixed relativepositions, the hinge 40 may apply a predefined force to enable the boneconductive speaker mechanism 20 to switch to the other one of the firstand the second fixed relative positions. The position of the boneconductive speaker mechanism 20 may not be automatically changed due toa gravity of itself or other factors, such that the user may accuratelyposition the bone conductive speaker mechanism 20.

In an embodiment, the bone conductive speaker mechanism 20 and the bodyportion 321 may be arranged in the first fixed relative position and thesecond fixed relative position only, and a transitional state betweenthe first and the second fixed relative positions is not available. Forexample, when the bone conductive speaker mechanism 20 and the bodyportion 321 are at the second fixed relative position as shown in FIG.4, the bone conduction eyeglasses may be used as general eyeglasses. Theuser may manually perform a force to the hinge 40 greater than thepredefined force to trigger the connection member 322. The connectionmember 322 and the bone conductive speaker mechanism 20 may be bentrelative to the body portion 321, such that the bone conductive speakermechanism 20 and the body portion 321 may be at the first fixed relativeposition, enabling the bone conductive speaker mechanism 20 to adhere toand fit with the back of the auricle of the user. In such a way, theuser may user the bone conduction eyeglasses as conventional eyeglassesand as an earphone at the same time. Other relative positionalrelationship between the first and the second fixed relative positionsmay not be available.

In other embodiments, the bone conductive speaker mechanism 20 and thebody portion 321 may be configured at one or more fixed relativepositions other than the first and the second fixed relative positionsto meet various demands of the user.

Alternatively, the bone conductive speaker mechanism 20 may include afitting face 21 configured to adhere to and fit with the back of theauricle of the user when the bone conductive speaker mechanism 20 is inuse, such that the sound/vibration may be conducted through the back ofthe auricle.

At least a portion of the fitting face 21 may be curved. For example,the back of the auricle may have an irregular shape, and the fittingface 21 may include a curved face protruding towards the back of theauricle, such that the bone conductive speaker mechanism 20 may well fitwith the back of the auricle. To be specific, the fitting face 21 mayfurther include a curved face being protruded and having a curvatureless than or equal to 1, such that the bone conductive speaker mechanism20 may sufficiently contact the back of the auricle, and the efficiencyof the bone conductive speaker mechanism 20 conducing thesound/vibration through the back of the auricle may be improved.

In addition, as shown in FIG. 10, in an embodiment, the fitting face 21may include a flat face 21 a in a middle of the fitting face 21 and acurved face 21 b extending along a circumferential direction of the flatface 21 a, i.e., the curved face 210 may extend away from an edge of theflat face 21 a. The flat face 21 a and the curved face 21 b maycooperatively form a curved fitting face protruding towards the back ofthe auricle.

Alternatively, an area of the fitting face 21 may be not less than 0.5cm² or 1 cm². As the area of the fitting face 21 of the presentembodiment is large enough, an area of a contact between the boneconductive speaker mechanism 20 and the back of the auricle may be largeenough, such that a pressure of the fitting face 21 of the boneconductive speaker mechanism 20 applied on the back of the auricle ofthe user may be reduced, providing a more comfortable bone conductivesound generating device for the user, and the efficiency of conductingthe sound/vibration through the bones may be improved, a volume of thesound may be high enough, and the user's demand may be met.

In one embodiment, as shown in FIG. 4, the connection member 322 may becurved to fit a shape of the auricle. A portion of the connection member322 may be curved along the shape of the auricle, such that when theuser is using the bone conductive sound generating device, theconnection member 322 may be configured to surround the back of theauricle of the user.

The connection member 322 may be a flexible connection rod beingelastic. The flexible connection rod may be made of rubber or have acomposite structure of the rubber and an elastic metal thread, such as acomposite structure of the rubber and a titanium or titanium alloythread, or a composite structure of the rubber and a memory alloythread.

When the user is wearing the bone conductive sound generating device andat least when the bone conductive sound generating device is in use,with a support from the eyeglass frame 30, the connection member 322 mayapply an elastic force to the bone conductive speaker mechanism 20, suchthat the bone conductive speaker mechanism 20 may be adhered to and fitwith the back of the auricle with a predefined pressure.

The predefined pressure may refer to a pressure that the fitting face 21applies to the user's ear along a direction perpendicular to the fittingface 21 when the user is wearing and using the bone conductive soundgenerating device. An elastic constant of the material of the connectionmember 322, a shape and a size of the connection member 322 mayinfluence the predefined pressure that the bone conductive speakermechanism 20 may apply to the back of the auricle. A test may beperformed to obtain the pressure that the fitting face 21 applies to theback of the auricle of the user. To be specific, as shown in FIG. 11,when the user is using the device normally, the fitting face 21 of thebone conductive speaker mechanism 20 may well fit the back of theauricle. A central point of a connection between the body portion 321and the connection member 322 may be a fixing point, and a hinge 40 maybe configured at the fixing point. A force detection apparatus may dragthe bone conductive speaker mechanism 20 away from the back of theauricle along a direction perpendicular to the fitting face 21. A forcewhich is detected at the time of the bone conductive speaker mechanism20 just leaving the back of the auricle may be taken as the pressurethat the bone conductive speaker mechanism 20 applies to the back of theauricle. Based on a detected value, the material, the shape, and thesize of the connection member 322 may further be determined, such that acorresponding pressure may be within a proper range.

Of course, a value of the predefined pressure may not be fixed. Forexample, when the user is wearing the bone conductive sound generatingdevice, various wearing states and various head shapes may correspond tovarious predefined pressures. Under such situations, as the connectionmember 322 is a flexible connection rod, the connection member 322 maybe deformed with various degrees to fit the various head shapes,adapting to various situations.

To be specific, an upper limit of the predefined pressure may be set tobe 1N. Under the upper limit, a relatively large scaled deformation ofthe bone conductive speaker mechanism 20 may not be caused by anexcessive pressure, such that the user may not feel pain or have otheruncomfortable feelings. A lower limit of the predefined pressure may be0.1N, such that the fitting face 21 may adhere to and fit with the backof the auricle when the bone conductive speaker mechanism 20 is working,and the bone conductive speaker mechanism 20 may not depart from theback of the auricle due to the vibration of the bone conduction speaker.

Alternatively, the upper limit of the predefined pressure may be 0.8N toreduce deformation of the auricle, such that the user may not feeluncomfortable when wearing the device for a long period of time. Thelower limit of the predefined pressure may be 0.3N, such that the boneconductive speaker mechanism 20 may stably adhere to and fit with theback of the auricle, while the area of the contact between the back ofthe auricle and the bone conductive speaker mechanism 20 may beincreased as the auricle deforms. In such a way, the area of the contactmay be large enough to conduct the sound/vibration through the bones,and the sound generating by a bone conductive sound generating devicemay be loud enough.

To be specific, the upper limit and the lower limit of the predefinedpressure may be in other values between 0.1N to 1N to satisfy varioushead shapes, such as head shapes of males, head shapes of females, headshapes of adults, head shapes of adolescents, and the like, which willnot be limited by the present disclosure.

Alternatively, the hinge 40 may include a hinge shaft 41, and the hingeshaft 41 may have a perpendicular bisector plane α. The connectionmember 322 may have a symmetric plane β. The fitting face 21 of the boneconductive speaker mechanism 20 may adhere to and fit with the ear andmay have a central point O. The perpendicular bisector plane α, thesymmetric plane β, and the central point O may be on a same plane or maybe on a substantially same plane with a predefined range of deviation.

The perpendicular bisector plane α of the hinge shaft 41 may refer to aplane perpendicular to an axis of the hinge shaft 41 and symmetricallyseparating the hinge shaft 41 into two identical parts, as shown in FIG.12.

The symmetrical plane β of the connection member 322 may refer to aplane symmetrically separating the connection member 322. That is, twoparts of the connection member 322 at two sides of the symmetrical planeβ may be identical, as shown in FIG. 13.

The predefined range of deviation may be calculated based on experiencesand statistical data of the material of the connection member, the sizeof the connection member, and the shape of the ear.

To be noted that, when the perpendicular bisector plane α of the hingerotational shaft 41, the symmetrical plane β of the connection member322, and the central point of the fitting face 21 of the bone conductivespeaker mechanism 20 are on the same plane, the bone conductive speakermechanism 20 which is connected to the connection member 322 directlyadhere to and fit with the back of the auricle. When the connectionmember 322 deforms by receiving a force, a direction of deformation maybe consistent with a direction along which the bone conductive speakermechanism 20 moves, and both directions are on the same plane. Asituation of the above-mentioned planes and points on different planesmay be avoided. When the connection member 322 deforms by receiving theforce, a situation of the bone conductive speaker mechanism 20 unable toadhere to and fit with the back of the auricle caused by twisting of theconnection member 322 and the bone conductive speaker mechanism 20 maybe avoided. Such the situation may reduce the efficiency of conductingthe sound/vibration, and further reduce the sound quality of the boneconductive sound generating device. Of course, the perpendicularbisector plane α of the hinge rotational shaft 41, the symmetrical planeβ of the connection member 322, and the central point of the fittingface 21 of the bone conductive speaker mechanism 20 may be substantiallyin the same plane with the predefined range of deviation. In such a way,when the device is in use, the user may not be affected significantly.However, to be noted that, the above-mentioned planes and points beingsubstantially in the same plane with the predefined range of deviationmay have an effect on the fitting with the back of the auricle offitting face 21 of the bone conductive speaker mechanism 20.

Alternatively, two arms may be arranged on the eyeglass frame, the twoarms may have two body portions 321, and the two body portions 321 mayhave two top portions. When the bone conductive speaker mechanism 20 andthe two body portions 321 are at the first fixed relative position, thetwo top portions of the two body portions 321 may define a horizontalreference plane γ. An angle between the horizontal reference plane γ andthe symmetrical plane β of the connection member 322 may be 65° to 85°.

The horizontal reference plane γ defined by the two top portions of thetwo body portions 321 may refer to a plane tangent to the two topportions at the same time. In an embodiment, the plane is furtherperpendicular to a symmetrical plane of the rim 31, as shown in FIG. 15.The symmetrical plane β of the connection member 322 of the presentembodiment is the same as the above embodiment as shown in FIG. 13, andwill not be described hereinafter repeatedly.

It may be understood that, when the bone conductive speaker mechanism 20and the body portion 321 are at the first fixed relative position, andwhen the angle between the horizontal reference plane γ defined by thetwo top portions of the two body portions 321 and the symmetrical planeβ of the connection member 322 is relatively large, the bone conductivespeaker mechanism 20 may be closer to an outer side of the back of theauricle, i.e., away from the skull. When the angle is excessively large,the bone conductive speaker mechanism 20 may even be unable to adhere toand fit with the auricle. When the angle is relatively small, the boneconductive speaker mechanism 20 may be closer to an inner side of theback of the auricle or even compress the skull, reducing the comfortwhen the user wearing the device. In another aspect, conducting thesound/vibration of the bone conduction speaker through the ear cartilagemay be affected, reducing the sound quality of the bone conductivespeaker mechanism 20. When the angle is between 65° to 85°, the boneconductive speaker mechanism 20 may be able to adhere to and fit with arelatively central position of the back of the auricle.

Further, when the bone conductive speaker mechanism 20 and the bodyportion 321 are at the first fixed relative position, the angle betweenthe horizontal reference plane γ defined by the two top portions of thetwo body portions 321 and the symmetrical plane β of the connectionmember 322 may be 70° to 82°, such that the fitting face 21 of the boneconductive speaker mechanism 20 may be closer to the region of the backof the auricle directly facing the crus of helix.

To be specific, when the bone conductive speaker mechanism 20 and thebody portions 321 are at the first fixed relative position, the anglebetween the horizontal reference plane γ defined by the two top portionsof the two body portions 321 and the symmetrical plane β of theconnection member 322 may be at any value within the above-mentionedrange, such as 70═, 75° 80°, 82°, and the like, which will not belimited by the present disclosure.

Alternatively, when the bone conductive speaker mechanism 20 and thebody portions 321 are at the first fixed relative position, an anglebetween the symmetrical plane of the rim 31 and the symmetrical plane βof the connection member 322 may be 5° to 30°.

The symmetrical plane 2, of the rim 31 may refer to a planesymmetrically separating the rim 31, as shown in FIG. 15. Thesymmetrical plane β of the connection member 322 in the presentembodiment may be the same as that in the above embodiment as shown inFIG. 13, and will not be repeatedly described hereinafter.

The angle between the symmetrical plane λ of the rim 31 and thesymmetrical plane β of the connection member 322 may be correlated withthe head shape of the user. For example, some users may have relativelylarge sized heads, and some may have relatively small sized head, andthey may correspond to different angles. When the user is wearing thedevice, the user's ear may support a bottom face of the body portion321, and a side face of the body portion may abut against the user'shead, such that the bone conductive speaker mechanism 20 may bepositioned at an appropriate position. Therefore, when the angle isrelatively small, a front portion of the body portion 321 may abutagainst the user's head, and a rear portion of the body portion 321 maybe away from the user's head. When the angle is relatively large, thefront portion of the body portion 321 may be away from the user's head,and the rear portion of the body portion 321 may abut against the user'shead. Under both situations, the body portion 321 may not contact thehead properly, such that the fitting face of the bone conductive speakermechanism 20 may depart from the back of the auricle, and the soundquality of the bone conductive speaker mechanism 20 may be reduced, theuser may not use the device conveniently.

When the bone conductive speaker mechanism 20 and the body portion 321are at the first fixed relative position, the angle between thesymmetrically plane of the rim 31 and the symmetrical plane β of theconnection member 322 may be 10° to 25°. Specifically, the angle may be10°, 15°, 20°, 25°, and the like, which will not be limited by thepresent disclosure.

Alternatively, as shown in FIG. 16, two arms 32 may have two hingeshafts 41. Each of the two hinge shafts 41 may have a central point. Adistance between two central points of the two hinge shafts 41 may beh₁, and the distance h₁ may be from 90 mm to 150 mm. The distance h₁ maycorrespond to a width of the user's head between a left and a right ofthe head.

It may be understood that, the two arms 32 may be positioned above twoears and grip two sides of the head. When the distance h₁ between thetwo central points of the two hinge shafts 41 of the two arms 32 isrelatively large, a gripping force that the two arms 32 applies to theuser's head may be relatively small, and the two arms may not stablygrip the user's head, such that the two arms may be loosen and departfrom the user's head, and the bone conductive speaker mechanism 20 maydeviate from a corresponding position of the back of the auricle. Whenthe distance his relatively small, the two arms may grip the user's headtoo tightly, and the user may feel uncomfortable.

The distance h₁ between the two central points of the two hinge shafts41 of the two arms may be from 100 mm to 130 mm. To be specific, thedistance may be 100, 110, 120 mm, 130 mm, and the like. To be notedthat, various users may select various earphones having appropriatedistances h₁ fitting their head shapes. For example, an earphone for amale user may have the distance h₁ of 115 mm to 130 mm, and an earphonefor a female user may have the distance h₁ of 100 mm to 115 mm. Ofcourse, the distance h₁ may be set to be a value in both of theabove-mentioned two ranges, such that the distance may be suitable forboth male and female users.

Alternatively, as shown in FIG. 16, a vertical distance h₂ from acentral point of the rim 31 to a line between the two central points ofthe two hinge shafts 41 may be 105 mm to 170 mm.

To be noted that, the central point of the rim 31 may be a mid-point ofa bridge of a nose.

It may be understood that, when the vertical distance h₂ is relativelylarge, and when the fitting face 21 of the bone conductive speakermechanism 20 adheres to and fits with the back of the auricle, the rim31 may be relatively far away from eyes of the user. When the rim 31 ispositioned properly, the fitting face 21 of the bone conductive speakermechanism 20 may be positioned relatively far away from the back of theauricle, such that the fitting face 21 may not adhere to and fit withthe back of the auricle properly. When the vertical distance isrelatively small, and when using the device as eyeglasses and as theearphone at the same time, the rim 31 and the bone conductive speakermechanism 20 may grip the user's head at the front and the back of theears too tight, such that the user may feel uncomfortable. When thevertical distance is excessively small, the user may be unable to usethe device as the eyeglasses and as the earphone at the same time.

The vertical distance h₂ from the central point of the rim to the linebetween the two central points of the two hinge shafts 41 may be 130 mmto 150 mm. To be specific, the vertical distance may be 130 mm, 140 mm,150 mm, and the like. To be noted that, various groups of users maycorrespond to various ranges of the vertical distance. For example, adevice for the male user may have the vertical distance h₂ in 140 mm to160 mm, and a device for the female user may have the vertical distanceh₂ in 105 mm to 135 mm. Of course, the vertical distance h₂ may be setto be a value within both of the above-mentioned two ranges, such thatthe device may be suitable for both male and female users.

Alternatively, as shown in FIGS. 16 and 10, a distance between thecentral point of the hinge shaft 41 and the central point O of acorresponding fitting face 21 of the bone conductive speaker mechanism20 may be defined to be h₃. The vertical distance h₂ may be from thesymmetrical central point of the rim to the line between the two centralpoints of the two hinge shafts 41. A ratio of the distance h₃ to thevertical distance h₂ (h₃/h₂) may be 0.1 to 1.5.

The distance h₃ between the central point of the hinge shaft 41 and thecentral point O of the corresponding fitting face 21 of the boneconductive speaker mechanism 20 may correspond to a distance between thecentral point of the hinge shaft 41 to a position of the fitting face 21for adhering to and fitting with the back of the auricle. The verticaldistance h₂ from the symmetrical central point of the rim 31 to the linebetween the two central points of the two hinge rotational shafts 41 maycorrespond to a vertical distance between the front of the user's headand the back of the user's ear. When the vertical distance between thefront of the user's head and the rear of the user's ear is fixed, andwhen the distance between the central point of the hinge rotationalshaft 41 and the position of the fitting face 21 for adhering to andfitting with the back of the auricle is relatively large. That is, theabove-mentioned ratio is relatively large, the distance between thecentral point of the hinge shaft 41 and the central point O of thecorresponding fitting face 21 of the bone conductive speaker mechanism20 may be relatively large, and the bone conductive speaker mechanism 20may tend to adhere to and fit with a lower portion of the back of theauricle. When the above-mentioned ratio is relatively small, thedistance between the central point of the hinge shaft 41 to the centralpoint O of the corresponding fitting face 21 of the bone conductivespeaker mechanism 20 may be relatively small, and the bone conductivespeaker mechanism 20 may tend to adhere to and fit with an upper portionof the back of the auricle. In such a way, the efficiency of the boneconductive speaker mechanism 20 conducting the sound/vibration may beaffected, further affecting the sound quality.

The ratio of h₃/h₂ may be 0.125 to 0.35. To be specific, the ratio maybe 0.125, 0.15, 0.25, 0.30, 0.35, and the like, and may be determinedaccording to various demands of the user, which will not be limited bythe present disclosure.

Further, various bone conductive sound generating devices in varioussizes may be produced based on the above-mentioned parameters, such thatusers may select an appropriate device based on their head shapes,various demands of the users may be met.

Further, as shown in FIGS. 17 and 18, a cross-sectional view of aportion of the bone conductive sound generating device according to anembodiment of the present disclosure is shown in FIG. 17, and anenlarged schematic view of a portion A shown in FIG. 17 is shown in FIG.18. In the present embodiment, the bone conductive sound generatingdevice may further include a first connection thread 50, and theeyeglass frame 30 may further include a rotational shaft assembly 33.

The first connection thread 50 may be a thread for mechanical connectionor electrical connection. In the present embodiment, a functionalassembly may be arranged in each of two arms 32, and the firstconnection thread 50 may be configured for the electrical connection toachieve certain functions. Two rotational shaft assemblies 33 may bearranged, each rotational shaft assembly 33 may be configured to connecteach rim 31 to the arm 32, such that the rim 31 and the arm 32 mayrotate around the rotational shaft assembly 33. The rotational shaftassembly 33 may define a thread channel 331 along an axial direction.The first connection thread 50 may be configured to extend through thethread channel 331 to reach the rim 31 and the arm 32 respectively.

To be specific, in the present embodiment, the first connection thread50 may extend through the thread channel 331. An end of the firstconnection thread 50 may extend to reach one of the two arms 32, and theother end of the first connection thread 50 may extend to reach the rim31. The first connection thread 50 may further extend along a firstreceiving groove 111 to reach the other one of the two arms 32, suchthat two functional assemblies 16 arranged in the two arms 32 may beelectrically connected.

It may be understood that, when the rim 31 and the two arms 32 are bentrelative to each other, a relative position of a structure near therotational shaft assembly 33 may be changed. When a portion of the firstconnection thread 50 arranged at a connection position between the rim31 and the arm 32 is arranged to surround an outer side of therotational shaft assembly 33 directly, the portion of the firstconnection thread 50 may be compressed or stretched as the rim 31 or thearm 32 are bent. The first connection thread 50 may be deformed ordisrupted, such that stability of the first connection thread 50 may beaffected, and service life of the first connection thread 50 may bereduced.

In the present embodiment, the rotational shaft assembly 33 may define athread channel 331 along the axial direction, and the portion of thefirst connection thread 50 arranged at the connection position betweenthe rim 31 and the arm 32 may be received in and extend through thethread channel 331. In such a way, when the rim 31 and the arm 32 arebent to each other, the first connection thread 50 received in thethread channel 331 may only rotate as the rotational shaft assembly 33rotates, and therefore reducing compress or stretch of the firstconnection thread 50, such that the first connection thread 50 may beprotected at some extent, improving the stability of the firstconnection thread 50 and increasing the service life of the firstconnection thread 50.

In the present embodiment, an inner diameter of the thread channel 331may be greater than an outer diameter of the first connection thread 50.For example, the inner diameter of the thread channel 331 may be twotimes of the outer diameter of the first connection thread 50, such thatthe constraint of the inner wall of the thread channel 331 on the firstconnection thread 50 may be reduced, and an amplitude of rotation of thefirst connection thread 50 may be reduced when the rim 31 and the arm 32are bent to each other.

Further as shown in FIGS. 18 and 19, a structural schematic view of therotational shaft assembly and the first connection thread of the boneconductive sound generating device is shown in FIG. 19. In the presentembodiment, the rotational shaft assembly 33 may include a firstrotational shaft 332. Two ends of the first rotational shaft 332 may beconnected to the rim 31 and the arm 32 respectively. The thread channel331 may be defined along an axial direction of the first rotationalshaft 332. The first rotational shaft 332 may define a thread opening3321 on at least one end face. The thread channel 331 may be fluidlycoupled to an external environment through the thread opening 3321. Thefirst connection thread 50 may be configured to extend to reach the rim31 or the arm 32 through the thread opening 3321.

To be noted that, in the present embodiment, the first rotational shaft332 may be rotatably connected to one of the rim 31 and the arm 32 andfixedly connected to the other of the rim 31 and the arm 32, such thatthe rim 31 and the arm 32 may be rotatably connected around the firstrotational shaft 332.

To be specific, in the present embodiment, the thread channel 331 may bedefined inside the first rotational shaft 332 and fluidly coupled to theexternal environment through the thread opening 3321.

To be specific, the thread channel 331 may be defined to extend throughat least one end face of the first rotational shaft 332, such that thethread opening 3321 of the thread channel 331 may be defined. In such away, the first connection thread 50 may extend along the thread channel331 to reach an outside of the thread channel via the at least one endface of the first rotational shaft 332, and further extend to reach therim 31 or the arm 32. It may be understood that, there may be a largereceiving space outside the end face of the first rotational shaft 332and unoccupied by any component. A portion of the first connectionthread 50 extending to the outside through the end face of the firstrotational shaft 332 may be received in the unoccupied receiving space.At the end face, when the first rotational shaft 332 is rotatablyconnected to the corresponding rim 31 or the arm 32, and when the rim 31and the arm 32 are bent relative to each other, a portion of the firstconnection thread 50 positioned near the thread opening 3321 of the endface may be twisted to some extent as the first rotational shaft 332rotates, and the unoccupied receiving space may be defined to buffer thetwisting of the first connection thread 50. The first connection thread50 being twisted may be transferred into the first connection thread 50being moving without being twisted, such that an extent of twisting thefirst connection thread 50 may be reduced, improving the stability ofthe first connection thread 50.

As shown in FIG. 20, a structural schematic view of the first rotationalshaft of the bone conductive sound generating device is shown. In thepresent embodiment, the thread opening 3321 may include a first threadopening 33211 and a second thread opening 33212. The first and thesecond thread openings are defined at two end faces of the firstrotational shaft 332 respectively. The thread channel 331 may be fluidlycoupled to the external environment through the two thread openings3321, such that the first connection thread 50 may extend through thetwo end faces of the first rotational shaft 332 and may extend to reachthe rim 31 and the arm 32 through the first thread opening 33211 and thesecond thread opening 33212 respectively.

In other words, in the present embodiment, the portion of the firstconnection thread 50 positioned at the connection position between therim 31 and the arm 32 may be received in the thread channel 331 of thefirst rotational shaft 332. The first connection thread 50 may extendout of the thread channel 331 through the two end faces of the firstrotational shaft 332. Under such the situation, as there may be arelatively large receiving space out of the two end faces of the firstrotational shaft 332 and unoccupied by any element of the device, whenthe rim 31 and the arm 32 rotate relative to each other, the firstconnection thread 50 that extends to the outside through the two endsfaces of the first rotational shaft 332 may move or may be twisted at arelatively small degree, such that the first connection thread 50 maynot be deformed due to being compressed or stretched.

Further as shown in FIG. 19, in the present embodiment, the threadopening 3321 may include a first thread opening 33213 and a secondthread opening 33214. The first thread opening 33213 may be defined onan end face of the first rotational shaft 332, and the second threadopening 33214 may be defined on a side wall of the first rotationalshaft 332. In such a way, an end of the thread channel 331 may befluidly coupled to the first thread opening 33213 to extend through theend face of the first rotational shaft 332, and the other end of thethread channel 331 maybe fluidly coupled to the second thread opening33214 to extend through the side wall of the first rotational shaft 332,such that the thread channel 331 may be fluidly coupled to the externalenvironment. The first connection thread 50 may extend along the threadchannel 331 to reach the rim 31 and the arm 32 through the first threadopening 33213 and the second thread opening 33214.

Similarly, there may be a relatively large receiving space near the endface of the first rotational shaft 332 defining the first thread opening33213 and unoccupied by any element of the device. When the rim 31 andthe arm 32 rotate relative to each other, the first connection thread 50positioned near the first thread opening 33213 may move only or may betwisted at a small degree.

In one embodiment, the first rotational shaft 332 may be fixedlyconnected to one of the rim 31 and the arm 32 closer to the secondthread opening 33214, and may be rotatably connected to the other one ofthe rim 31 and the arm 32. In other words, an end of the firstrotational shaft 332 defining the thread opening 3321 may be rotatablyconnected to one of the rim 31 or the arm 32, and the side wall definingthe thread opening 3321 may be fixedly connected to the other one of therim 31 or the arm 32.

In one embodiment, the end of the first rotational shaft 332 definingthe first thread opening 33213 is closer to the rim 31, and is rotatablyconnected to the rim 31. The side wall of the first rotational shaft 332defining the second thread opening 33214 is closer to the arm 32, and isfixedly connected to the arm 32.

To be noted that, in the present embodiment, although the firstrotational shaft 332 is rotatably connected to the rim 31, relativerotation between the rim 31 and the arm 32 may drive the firstconnection thread 50 to move relative to the first thread opening 33213.However, as the first thread opening 33213 is defined on the end face ofthe first rotational shaft 332, being similar to the above embodiment,there may be a relatively large receiving space near the end face of thefirst rotational shaft 332 and unoccupied by any element of the device.When the rim 31 and the arm 32 are bent rotatably relative to eachother, the portion of the first connection thread 50 positioned near thethread opening 3321 of the end face may be twisted to some extent as thefirst rotational shaft 332 rotates, and the unoccupied receiving spacemay buffer the twisting of the portion of the first connection thread50. The portion of the first connection thread 50 being twisted may betransformed into the portion of the first connection thread 50 beingmoving. Alternatively, the first connection thread 50 may be twisted ata small degree. In such a way, the first connection thread 50 may not becompressed or stretched, such that the stability of the connectionthread may be improved, and the service life of the connection threadmay be increased.

Further, the side wall of the first rotational shaft 332 may be fixedlyconnected to the arm 32. It may be understood that, when the rim 31 andthe arm 32 are rotated relative to each other, the rim 31 and the firstrotational shaft 332 may move synchronously. Therefore, the firstconnection thread 50 received in the thread channel 331 may extend toreach the rim 31 through the second thread opening 33214, and may not betwisted, compressed, or stretched. Therefore, the second thread opening33214 may be defined on the end face of the first rotational shaft orthe side wall of the first rotational shaft 332, and under eithersituation, relative rotation between the rim 31 and the arm 32 may notcause the first connection thread 50 to be twisted, compressed,stretched, or the like.

In other embodiments, when the side wall of the first rotational shaft332 and the arm 32 are rotatably connected, and when the firstrotational shaft 332 and the arm 32 rotate relative to each other to(hive the first connection thread 50 to move, the first connectionthread 50 may be constrained by a side wall of the second thread opening33214 of the first rotational shaft 3321. Under such the situation, thefirst connection thread 50 may be compressed by the side wall of thefirst rotational shaft 332 and the arm 32.

When the end of the first rotational shaft 332 close to the arm 32 isconfigured to define the first thread opening 33213 and is rotatablyconnected to the arm 32, the side wall of the first rotational shaft 332close to the rim 31 may be configured to define the second threadopening 33214 and may be fixedly connected to the rim 31. Similarly,when the rim 31 and the arm 32 are bent relative to each other, thefirst connection thread 50 received in the thread channel 331 may have aportion positioned near the first thread opening 33213 and anotherportion positioned near the second thread opening 33214, and the twoportions of the first connection thread 50 may only be twisted at asmall degree or moved without being twisted.

As shown in FIG. 19, in one embodiment, the rotational shaft assembly 33may further include a second rotational shaft 333, the second rotationalshaft 333 may be spaced apart from the first rotational shaft 332, andthe second rotational shaft 333 and the first rotational shaft 332 maybe coaxial.

In the present embodiment, the second rotational shaft 333 may bearranged at a side of the first rotational shaft 332 close to the firstthread opening 33213. Of course, in other embodiments, the secondrotational shaft 333 may be arranged at a side of the first rotationalshaft 332 close to the second thread opening 33214.

Further referring to FIG. 21, an exploded perspective view of a portionof the bone conductive sound generating device is shown. In the presentembodiment, the rim 31 may include a first ledge 311. To be specific,the rim 31 may include two first ledges, the two first ledges 311 may bearranged at two ends of the rim respectively, the two ends may beconnected to the two arms 32, and the two ledges 311 may protrude fromthe rim 31 towards the two arms 32 correspondingly.

The arm 32 may include a second ledge 3201 and a third ledge 3202, andthe second ledge 3201 and the third ledge 3202 may be spaced apart fromeach other. The second ledge 3201 and the third ledge 3202 may protrudefrom the arm 32 towards the end of the rim 31 connected to the arm 32.When the user is wearing the eyeglasses, a side of the second ledge 3201away from the user may be connected to a side of the third ledge 3202away from the user, such that the eyeglasses may show an aesthetic andintegral appearance. In an embodiment, an end of the arm 32 facing therim 31 may have a middle portion, and the middle portion may define aconcave to form the second ledge 3201 and the third ledge 3202.

Further, an end of the first rotational shaft 332 close to the secondrotational shaft 333 and an end of the second rotational shaft 333 closeto the first rotational shaft 332 may be connected to the first ledge311. An end of the first rotational shaft 332 away from the secondrotational shaft 333 and an end of the second rotational shaft 333 awayfrom the first rotational shaft 332 may be connected to the second ledge3201 and the second ledge 3202 respectively. In such a way, the firstledge 311 may be configured between the second ledge 3201 and the thirdledge 3202.

As shown in FIG. 19, in an embodiment, the first thread opening 33213may be defined on the end face of the first rotational shaft 332 closeto the second rotational shaft 333. The second thread opening 33214 maybe defined on the side wall of the first rotational shaft 332 close tothe second ledge 3201. The first rotational shaft 332 may be rotatablyconnected to the first ledge 311 and fixedly connected to the secondledge 3201.

To be specific, in the present embodiment, an end of the firstconnection thread 50 received in the thread channel 331 may extend tothe external environment through the first thread opening 33213 andthrough a space between the first rotational shaft 332 and the secondrotational shaft 333. Further, in one embodiment, the first ledge 311defines a thread channel being fluidly coupled to the first threadopening 33213, such that the first connection thread 50 may extend toreach an inside of the rim 31 through the first ledge 311.

In addition, the other end of the first connection thread 50 received inthe thread channel 331 may extend to the external environment throughthe second thread opening 33214. Further, in an embodiment, the thirdledge 3202 may define a thread channel being fluidly coupled to thesecond thread opening 33214, such that the first connection thread 50may extend to reach the inside of the arm 32 through the thread channelin the third ledge 3202.

The second thread opening 33214 may be defined on the side wall of thefirst rotational shaft 332, instead of being defined on the end of thefirst rotational shaft 332 to be fluidly coupled to the thread channel331 of the rotational shaft. In the present embodiment, the secondthread opening 33214 may extend along the side wall of the firstrotational shaft 332 to reach an end of the first rotational shaft 332away from the first thread opening 33213. It may be understood that, inthe present embodiment, the second thread opening 33214 may be definedto have a larger space, such that when the first connection thread 50moves due to certain factors, constraint applied on the first connectionthread 50 may further be reduced, further reducing a possibility ofdamaging the first connection thread 50 caused by the constraint of theside wall of the first rotational shaft 332.

Further referring to FIGS. 21-23, a structural schematic view of the rimand a lens of the bone conductive sound generating device is shown inFIG. 22, and a structural schematic view of a portion of the rim of thebone conductive sound generating device is shown in FIG. 23. In thepresent embodiment, the first ledge 311 and the second ledge 3201 maydefine a first receiving hole 3111 and a second receiving hole 32011,and the first receiving hole 3111 and the second receiving hole 32011may be coaxial. The first receiving hole 3111 and the second receivinghole 32011 may be defined to enable the first rotational shaft 332 toinsert from an outside of the arm 32 through the second receiving hole32011 to be received in the first receiving hole 3111. The firstreceiving hole 3111 and the second receiving hole 32011 may further bedefined to enable the first rotational shaft 332 to tightly abut againstan inner wall of the second receiving hole 32011 and to enable the firstrotational shaft 332 be received in the first receiving hole 3111,wherein the first rotational shaft 322 and an inner wall of firstreceiving hole 3111 may define a gap.

To be specific, the second receiving hole 32011 may be defined to extendthrough the second ledge 3201. A face of the first ledge 311 facing thesecond receiving hole 32011 may be recessed for a certain length todefine the first receiving hole 3111, and the first receiving hole 3111may correspond to and may be fluidly coupled to the second receivinghole 32011. A diameter of the first receiving hole 3111 may be greaterthan a diameter of the second receiving hole 32011. An outer diameter ofthe first rotational shaft may be less than the diameter of the firstreceiving hole 3111 and greater than the diameter of the secondreceiving hole 32011. In such a way, the first rotational shaft 332 maybe fixedly connected to the arm 32 and rotatably connected to the rim31, such that the rim 31 and the arm 32 may rotate around the firstrotational shaft 332 to be bent or unfolded relative to each other.

Further, in an embodiment, the first ledge 311 and the third ledge 3202may define the third receiving hole 3112 and the fourth receiving hole32021 respectively, and the third receiving hole 3112 and the fourthreceiving hole 32021 may be coaxial. The third receiving hole 3112 andthe fourth receiving hole 32021 may be defined to enable the secondrotational shaft 333 to insert from an outside of the arm 32 through thefourth receiving hole 32021 to be received in the third receiving hole3112. The third receiving hole 3112 and the fourth receiving hole 32021may be defined to enable the second rotational shaft 333 to be tightlyreceived in the third receiving hole 3112 and loosely received in thefourth receiving hole 32021. Alternatively, the third receiving hole3112 and the fourth receiving hole 32021 may be defined to enable thesecond rotational shaft 333 to be loosely received in the thirdreceiving hole 3112 and tightly received in the fourth receiving hole32021.

In the present embodiment, the third receiving hole 3112, the fourthreceiving hole 32021, the first receiving hole 3111, and the secondreceiving hole 32011 may be coaxial. The third receiving hole 3112 maybe defined by a face of the first ledge 311 facing the third receivinghole 32011 being recessed for a certain length. In an embodiment, thefirst receiving hole 3111 and the third receiving hole 3112 may becoaxial and may be fluidly coupled to each other. To be specific, asdescribed in the above embodiment, the first ledge 311 of the rim 31 maydefine the thread channel being fluidly coupled to the first threadopening 33213, the first receiving hole 3111 and the second receivinghole 3112 may be fluidly coupled to two ends of the thread channel inthe first ledge 311 respectively. The fourth receiving hole 32021 mayextend through the third ledge 3202. A diameter of the third receivinghole 3112 may be greater than a diameter of the fourth receiving hole32021, and the outer diameter of the second rotational shaft 333 may beless than the diameter of the third receiving hole 3112 and greater thanthe diameter of the fourth receiving hole 32021. Alternatively, thediameter of the fourth receiving hole 32021 may be greater than thediameter of the third receiving hole 3112. In such a way, the secondrotational shaft 333 may be fixedly connected to the arm 32 androtatably connected to the rim 31. Alternatively, the second rotationalshaft 333 may be fixedly connected to the rim 31 and rotatably connectedto the arm 32. In such a way, the rim 31 and the arm 32 may rotatearound the first rotational shaft 332 to be bent or unfolded relative toeach other.

In one embodiment, the second rotational shaft 333 may be a solid shaft,and the outer diameter of the rotational shaft 333 may refer to adiameter of the second rotational shaft 333 and may be less than theouter diameter of the first rotational shaft 332. When the user iswearing the device, the second rotational shaft 333 may be arranged on atop of the arm 32, and the first rotational shaft 332 may be arranged ona bottom of the arm 32.

To be noted that, as the thread channel 331 is defined inside the firstrotational shaft 332, the outer diameter of the first rotational shaft332 may be relatively large, unable to satisfy a demand of an aestheticappearance. Therefore, in the present embodiment, the second rotationalshaft 333 having a relatively small outer diameter may be arranged, suchthat when the user is wearing the eyeglasses, the second rotationalshaft 333 may tend to be arranged on the top of the arm and may beeasily noticed by the user, and the first rotational shaft 332 may bearranged on the bottom of the arm and may not be easily noticed by theuser. As the outer diameter of the second rotational shaft 333 may berelatively small, the aesthetic integral appearance of the eyeglassesmay be improved to some extent.

Of course, in other embodiments, the first rotational shaft 332 and thesecond rotational shaft 333 may be arranged in other manners. Forexample, the second rotational shaft 333 may be a hollow shaft, and adiameter of the second rotational shaft 333 may be greater than adiameter of the first rotational shaft 332. Alternatively, when the useris wearing the eyeglasses, the second rotational shaft 333 may bearranged on the bottom of the arm 32, and the first rotational shaft 332may be arranged on the top of the arm 32, which will not be limited bythe present disclosure.

In addition, as shown in FIG. 19, a connection position between the endface 3322 of the first rotational shaft 332 defining the first threadopening 33213 and an inner side wall 3323 of the first rotational shaft332 defining the thread channel 331 may be in a shape of an arc. It maybe understood that, when the rim 31 and the arm 32 rotate through therotational assembly 33, the first rotational shaft 332 may be rotatablyconnected to the rim 31, such that the portion of the first connectionthread 50 positioned near the first thread opening 33213 may be drivento move. In the present embodiment, by arranging the connection positionbetween the end face 3322 of the first rotational shaft 332 and theinner side wall 323 to be in the shape of the arc, when the portion ofthe first connection thread 50 positioned near the first thread opening33213 moves and contacts the first rotational shaft 332, the firstconnection thread 50 may not be cut due to sharpness of the connectionposition between the end face 3322 and the inner side wall 323, suchthat the first connection thread 50 may further be protected.

In an embodiment, a connection position between the end face of thefirst rotational shaft 332 defining the second thread opening 33214 andthe inner side wall 3323 of the first rotational shaft 332 defining thethread channel 331 may be in the shape of the arc. Similarly, in such away, the first connection thread 50 may further be protected.

Further as shown in FIGS. 24 and 25, the hinge 40 may further include ahinge base 42 and a hinge arm 43, and the hinge arm 43 may be rotatablyconnected to the hinge base 42 through the hinge shaft 41.

The hinge base 42 may be connected to the body portion 321, such thatthe hinge 40 may be arranged at an end of the body portion 321 away fromthe rim 31.

To be specific, the body portion 321 may define a hinge chamber 3211along a length direction of the body portion 321, and the hinge chamber3211 may further extend through an end face of the body portion 321 awayfrom the rim 31 to be fluidly coupled to an outside of the body portion321. A side wall of the body portion 321 may define a first insertionhole 3212 being fluidly coupled to the hinge chamber 3211. An end of thehinge base 42 away from the hinge arm 43 may be inserted into the hingechamber 3211 through the end face of the body portion 321. A fixingmember 323 may be received in the first insertion hole 3212, and the endof the hinge base 42 may be fixedly received in the hinge chamber 3211through the fixing member 323. The hinge 40 may be connected to the bodyportion 321.

The hinge chamber 3211 may be defined when the body portion 321 is beingformed. For example, a material of the body portion 321 may be rubber,plastics, or the like. When molding is performed to form the bodyportion 321, the hinge chamber 3211 may be defined. A shape of the hingechamber 3211 may fit with a shape of the hinge base 42, such that thehinge base 42 may be received in the hinge chamber 3211. In the presentembodiment, the hinge base 42 may be in a shape of a long-straight rodalong a length direction of the body portion 321. Correspondingly, thebody portion 321 may be a straight rod along the length direction, andthe hinge chamber 3211 may be defined along the straight rod. Further,the hinge base 42 may fit with and may be received in the hinge chamber3211 to achieve configuration of the hinge 40. Of course, in otherembodiments, the body portion 321 may be arranged to be in a shape of anarched rod or the like.

Further, the first insertion hole 3212 may be defined when the bodyportion 321 is being formed. Alternatively, after the body portion 321is formed, a side wall of the body portion 321 may be drilled to definethe first insertion hole 3212. To be specific, in the presentembodiment, a shape of the first insertion hole 3212 may be circular. Inother embodiments, the shape of the first insertion hole 3212 may besquared, triangular, or the like. A shape of the fixing member 323 mayfit with a shape of the first insertion hole 3212, such that the fixingmember 323 may be inserted into the first insertion hole 3212 from anoutside of the body portion 321. Further, the fixing member 323 mayenable the hinge base 42 to be fixedly received in the hinge chamber3211 by abutting against a side wall of the hinge base 42 tightly or byextending through a side wall of the hinge base 42 to insert to aninside of the hinge base 42. To be specific, each of an inner wall ofthe first insertion hole 3212 and an outer wall of the fixing member 323may be arranged with a screw thread correspondingly, such that thefixing member 323 may be threaded to be received in the first insertionhole 3212 to further enable the hinge base 42 to be received in thehinge chamber 3211. Of course, the fixing member 323 may be received inthe first insertion hole 3212 by other means, such as by an interferencefit.

Further, the hinge arm 43 may be connected to the connection member 322,such that after the connection member 322 is connected to the hinge arm43, the hinge base 42 may be received in the hinge chamber 3211 of thebody portion 321, such that the hinge arm 43 and the body portion 321may rotate around the hinge shaft 41. The bone conductive speakermechanism 20 may be connected to an end of the hinge arm 43 away fromthe hinge base 42, such that the bone conductive speaker mechanism 20may be connected to the end of the body portion 321 away from the rim31.

In the above embodiment, the body portion 321 defines the hinge chamber3211 extending through the end face of the body portion 321 to becoupled to the outside of the body portion 321. The hinge 40 may bereceived in the hinge chamber 3211 through the hinge base 42. The fixingmember 323 may extend through the side wall of the body portion 321 viathe first insertion hole 3212. In such a way, the hinge base 42 receivedin the hinge chamber 3211 may be fixedly received in the hinge chamber3211, such that the hinge 40 may be detachable from the body portion321, and the bone conductive speaker mechanism 20, the rim 31, the bodyportion 321, or other components may be replaced if damaged.

Further, as shown in FIG. 25, in one embodiment, the hinge base 42defines a second insertion hole 421 corresponding to the first insertionhole 3212, and the fixing member 323 may further be inserted into thesecond insertion hole 421.

To be specific, a shape of the second insertion hole 421 may fit withthe fixing member 323, such that after the fixing member 323 extendsthrough the first insertion hole 3212, the fixing member 323 may furtherbe inserted into the second insertion hole 421 to fix the hinge base 42.In such a way, the hinge base 42 may not falter inside the hinge chamber3211, and the hinge 40 may be fixed more stably. To be specific, beingsimilar to the fixing member 323 being received in the first insertionhole 3212, an inner wall of the second insertion hole 421 may bearranged with a screw thread corresponding to the screw thread arrangedon the outer wall of the fixing member 323, such that the fixing member323 may be threaded to connect to the hinge base 42. Alternatively, thehinge base 42 may have an outer wall corresponding to the inner wall ofthe second insertion hole 421 at which contacts the outer wall of thefixing member 323, and the surface of the corresponding outer wall maybe smooth. The fixing member 323 may have an interference fit with theinner wall of the second insertion hole 421, which will not be limitedby the present embodiment.

Further, the second insertion hole 421 may extend through two oppositesides of the hinge base 42, such that the fixing member 323 may furtherextend through the entire hinge base 42, and the hinge base 42 may befixedly received in the hinge chamber 3211 more stably.

Further referring to FIG. 26, in the present embodiment, across-sectional plane perpendicular to the length direction of the bodyportion 321 may be defined, a shape of a cross section of the hinge base42 taken along the cross-sectional plane may fit with a shape of thehinge chamber 3211 taken along the cross-sectional plane, such thatafter the fixing member 323 is inserted, the hinge base 42 and the bodyportion 321 may be engaged to form a seal.

Taken along the cross-sectional plane shown in FIG. 26, the shape of thehinge base 42 and the shape of the hinge chamber 3211 may not be limitedby the present disclosure, with the proviso that the hinge base 42 ableto be inserted into the hinge chamber 3211 from the end face of the bodyportion 321 away from the hinge arm 43. Further, the first insertionhole 3212 may be defined on the side wall of the hinge chamber 3211 andextend through the side wall of the hinge chamber 3211 to be fluidlycoupled to the hinge chamber 3211.

In an embodiment, the cross section of the hinge base 42 taken along thecross-sectional plane and the cross section of the hinge chamber 3211taken along the cross-sectional plane may be in a shape of rectangle,and the first insertion hole 3212 may be defined to be perpendicular toa side of the rectangle.

To be specific, in the present application scenario, a fillet may bearranged on the outer wall of the hinge base 42 or the inner wall of thehinge chamber 3211, such that the hinge base 42 may contact the hingechamber 3211 more smoothly, enabling the hinge base 42 to be easilyinserted into the hinge chamber 3211.

To be further noted that, before configuring the hinge 40, a certainvolume of air may be received in the hinge chamber 3211. Therefore, whenthe hinge chamber 3211 defines only one opening being fluidly coupled tothe external environment, the air in the hinge chamber 3211 may bedifficult to be expelled out when the hinge base 42 is being insertedinto the hinge chamber 3211, affecting the configuration. In the presentembodiment, the first insertion hole 3212 may extend through the sidewall of the hinge chamber 3211 to be fluidly coupled to the hingechamber 3211, such that in a process of configuration, the air insidethe hinge chamber 3211 may be expelled out through the first insertionhole 3212, enabling the hinge 40 to be configured normally and easily.

Further referring to FIG. 27, in some embodiments, the bone conductivesound generating device may further include a second connection thread60 arranged on an outside of the hinge 40.

Similar to the first connection thread 50, the second connection thread60 may be a thread for electrical connection and/or mechanicalconnection. In the present embodiment, the hinge 40 and the like may beconfigured to connect the bone conductive speaker mechanism 20 to theend of the body portion 321 away from the rim 31. A control circuitrelated to the bone conductive speaker mechanism 20 may be arranged inthe body portion 321. Under such the situation, the second connectionthread 60 may be configured to connect the bone conductive speakermechanism 20 to the control circuit in the body portion 321. To bespecific, the second connection thread 60 may be disposed on a side ofthe hinge base 42 and the hinge arm 43. The second connection thread 60and the hinge 40 may be received in a same space. The second connectionthread 60 and the first connection thread 50 may be connected orindependent from each other.

Further, the hinge base 42 may include a first end face 422, and thehinge arm 43 may include a second end face 431 facing to the first endface 422. It may be understood that, a gap may be defined between thefirst end face 422 and the second end face 431, such that the hinge base42 and the hinge arm 43 may rotate relative to each other around thehinge shaft 41. In the present embodiment, when the hinge arm 43 and thehinge base 42 are rotating relative to each other, a relative positionbetween the first end face 422 and the second end face 431 may bechanged correspondingly, such that the gap between the first end face422 and the second end face 431 may be increased or decreased.

In the present embodiment, the gap between the first end face 422 andthe second end face 431 may always be greater or less than a diameter ofthe second connection thread 60. In such a way, the second connectionthread 60 disposed on the outside of the hinge 40 may not be clampedinto the gap between the first end face 422 and the second end face 431when the hinge base 42 and the hinge arm 43 are rotating relative toeach other, such that a damage to the second connection thread 60 may bereduced. To be specific, while the hinge arm 43 and the hinge base 42are rotating relative to each other, a ratio of the gap between thefirst end face 422 and the second end face 431 to the diameter of thesecond connection thread 60 may be maintained to be greater than 1.5 orless than 0.8 at all times, such as greater than 1.5, 1.7, 1.9, 2.0, andthe like, or less than 0.8, 0.6, 0.4, 0.2, or the like, which will notbe limited by the present disclosure.

In some embodiments, the bone conductive sound generating device mayfurther include a protective case 70. As shown in FIGS. 4, 28, and 31,the protective case 70 may be configured to encase an outer side of thehinge 40 and may be bent as the hinge 40 is bent. The protective case 70may include a plurality of ring-shaped ridges 71 and a plurality ofring-shaped connection portions 72. The plurality of ring-shaped ridges71 may be arranged along a length direction of the protective case 70and spaced apart from each other. The plurality of ring-shapedconnection portions 72 may be arranged between two adjacent ridges 71and connect the two adjacent ridges 71. A thickness of a wall of eachridge 71 may be greater than a thickness of a wall of each connectionportion 72.

The length direction of the protective case 70 may be the same as thelength direction of the hinge 40. The protective case 70 may be arrangedalong a length direction of the hinge base 42 and the hinge arm 43. Theprotective case 70 may be made of soft materials, such as soft silicon,rubber, and the like.

The ring-shaped ridge 71 may be formed by an outer wall of theprotective case 70 protruding to an outside, and a shape of an innerwall of the protective case 70 corresponding to the ridge 71 may not belimited by the present disclosure. For example, the surface of the innerwall may be smooth or recessed at a position corresponding to the ridge71.

The ring-shaped connection portion 72 may be configured to connect thetwo adjacent ring-shaped ridges 71. To be specific, the connectionportion 72 may be configured to connect to an edged region of the ridge71 close to an inside of the protective case 70, such that the outerside of the protective case 70 may have recesses relative to the ridges71.

To be specific, the number of the ring-shaped ridges 71 and the numberof the ring-shaped connection portions 72 may be determined according toactual needs, such as according to a length of the protective case 70, awidth of the ring-shaped ridges 71 along the length direction of theprotective case 70, a width of the ring-shaped connection portions 72along the length direction of the protective case 70, and the like.

Further, the thickness of the wall of the ring-shaped ridge 71 may referto a distance between the inner wall of the protective case 70 and theouter wall of the protective case 70 at a position corresponding to theridge 71, and the thickness of the wall of the ring-shaped connectionportion 72 may refer to a distance between the inner wall of theprotective case 70 and the outer wall of the protective case 70 at aposition corresponding to the connection portion 72. In the presentembodiment, the thickness of the wall of the ring-shaped ridge 71 may begreater than the thickness of the wall of the ring-shaped connectionportion 72.

It may be understood that, when the hinge base 42 and the hinge arm 43of the hinge 40 rotate relative to each other around the hinge shaft 41,an angle between the hinge base 42 and the hinge arm 43 may be changed,such that the protective case 70 may be bent, as shown in FIG. 30 andFIG. 31. To be specific, when the protective case 70 is bent as thehinge 40 is bent, a bent region of the protective case 70 may be formed,a portion of the ring-shaped ridge 71 and a portion of the ring-shapedconnection portion 72 may be arranged at an outer region of the bentregion and may be stretched. Another portion of the ring-shaped ridge 71and another portion of the ring-shaped connection portion 72 may bearranged at an inner region of the bent region and may be compressed.

In the present embodiment, the thickness of the wall of the ring-shapedridge 71 may be greater than the thickness of the wall of thering-shaped connection portion 72, such that the ring-shaped ridge 71may be more rigid than the ring-shaped connection portion 72. In such away, when the protective case 70 is bent, the portion of the ring-shapedridge arranged at the outer region of the bent region may be stretched,and the ring-shaped ridge 71 may provide a support of certain strengthto the protective case 70. At the same time, the another portion of thering-shaped ridge 71 arranged at the inner region of the bent region maybe compressed, and the ring-shaped ridge 71 may be resistant tocompression to some extent. In such a way, the protective case 70 may beprotected, stability of the protective case 70 may be improved, and aservice life of the protective case 70 may be increased.

Further, it may be noted that, a shape of the protective case 70 may beconsistent with a state of the hinge 40. In an embodiment, theprotective case 70 may be stretched or compressed along the lengthdirection of the protective case 70, and two sides of the protectivecase 70 rotating around the rotational shaft may be stretched orcompressed. In another embodiment, the hinge base 42 and the hinge arm43 of the hinge 40 may be configured to rotate around the hinge shaft 41within a range of 180°. In other words, the protective case 70 may beconfigured to be bent towards only one side, and that is, only one ofthe two sides of the protective case 70 along the length direction ofthe protective case 70 may be compressed, and the other one of the twosides may be stretched only. Under such the situation, based ondifferent forces applied to the two sides of the protective case 70, thetwo sides of the protective case 70 may be configured to have differentstructures.

In an embodiment, when the protective case 70 is bent, a width of theportion of the ring-shaped ridge 71 arranged at the outer region of thebent region along the length direction of the protective case 70 may begreater than a width of the another portion of the ring-shaped ridge 71arranged at the inner region of the bent region along the lengthdirection of the protective case 70.

Along the length direction of the protective case 70, increasing thewidth of the ring-shaped ridge 71 may further increase rigidity of theprotective case 70. At the same time, in the present embodiment, aninitial angle between the hinge base 42 and the hinge arm 43 may be lessthan 180°. The initial angle may refer to an angle between the hingebase 42 and the hinge arm 43 when the bone conducted sound generatingdevice serves as eyeglasses only, and the bone conducted speakermechanism 20 does not adhere to and fit with the back of the auricle.Under such the situation, when the ring-shaped ridge 71 of theprotective case 70 is arranged to have an even width, the protectivecase 70 may be compressed at an initial state. The initial state mayrefer to a state of the bone conducted sound generating device servingas eyeglasses only and the bone conducted speaker mechanism 20 notadhering to and fitting with the back of the auricle. In the presentembodiment, in a bent state, the width of the portion of the ring-shapedridge 71 arranged at the outer region of the bent region may berelatively large, such that a length of a portion of the protective case70 at the outer region of the bent region may be increased. In such away, the rigidity of the protective case 70 may be increased, and whenthe protective case 70 is bent, a stretched side may be less stretched.At the same time, when the protective case 70 is in the bent state, thewidth of the another portion of the ring-shaped ridge 71 arranged at theinner region of the bent region may be relatively small, increasing aspace for the compressed ring-shaped connection portion 72 along thelength direction of the protective case 70, such that the compressionapplied to the compressed side of the protective case 70 may be relievedto some extent.

Further, in an embodiment, the width of the ring-shaped ridge 71gradually decreases from the portion of the ring-shaped ridge 71arranged at the outer region of the bent region to the another portionof the ring-shaped ridge 71 arranged at the inner region of the bentregion, such that when the protective case 70 is in the bent state, thewidth of the portion of the ring-shaped ridge 71 arranged at the outerregion of the bent region is greater than the width of the anotherportion of the ring-shaped ridge 71 arranged at the inner region of thebent region.

It may be understood that, the ring-shaped ridge 71 may be configured tosurround the outer side of the protective case 70. Along the lengthdirection of the protective case 70, a side of the protective case 70may correspond to a stretched side, and another side of the protectivecase 70 may correspond to a compressed side. In the present embodiment,the width of the ring-shaped ridge 71 may gradually decrease from theportion of the ridge 71 arranged at the outer region of the bent regionto the another portion of the ridge 71 arranged at the inner region ofthe bent region, such that the width of the protective case 70 may berelatively uniform, the stability of the protective case 70 may beincreased to some extent.

In one embodiment, when the protective case 70 is in the bent state, theinner wall of the protective case 70 corresponding to the portion of thering-shaped ridge 71 arranged at the outer region of the bent region maydefine a recess 711.

To be specific, in the present embodiment, the recess 711 may be definedto extend perpendicular to the length direction of the protective case70, such that the corresponding ridge 71 may be spread properly alongthe length direction of the protective case 70 when being stretched.

According to the above description, when the protective case 70 is inthe bent state, the outer region of the bent region of the protectivecase 70 may be in a stretched state. In the present embodiment, theinner wall of the protective case 70 corresponding to the ring-shapedridge 71 may define the recess 711. In such a way, when the protectivecase is stretched, the ring-shaped ridge 71 corresponding to the recess711 may spread properly to resist stretching to some extent, such that astretching force applied to the side of the protective case may bereduced, such that the protective case 70 may be protected.

To be noted that, when the protective case is in the bent state, theinner wall of the protective case 70 corresponding to the anotherportion of the ring-shaped ridge 71 arranged at the inner region of thebent region may not define the recess 711. In an embodiment, a width ofthe ridge 71 along the length direction of the protective case 70 maygradually decrease from the portion arranged at the outer region of thebent region to the another portion arranged at the inner region of thebent region. In such a way, in the inner wall of the protective case 70corresponding to the ring-shaped ridge 71 arranged at the inner regionof the bent region may not define the recess 711.

To be specific, the protective case 70 may connect the body portion 321to the bone conductive speaker mechanism 20, and the body portion 321and the bone conductive speaker mechanism 20 may be arranged at twosides of the protective case 70 along the length direction of theprotective case 70. In an embodiment, the protective case 70 and otherstructures of the bone conductive sound generating device, such as aprotective cover of some components, may be configured as an overallstructure, such that the bone conductive sound generating device may besealed and integral.

To be specific, as shown in FIGS. 32 to 36, in some embodiments, thehinge arm 43 of the hinge 40 may have a first support face 432 and asecond support face 433 connected with each other. The hinge 40 mayfurther include a supportive member 44 and an elastic member 45. Thesupportive member 44 may be movably arranged on the hinge base 42 andmay have a third support face 441. The elastic member 45 may beconfigured to offset the supportive member 44 towards the hinge arm 43,such that the third support face 441 may elastically abut against thefirst support face 432 and the second support face 433.

When the external force is applied to the bone conductive speakermechanism 20 or the connection member 322 to drive the hinge arm 43 torotate relative to the hinge base 42, a connective position 434 betweenthe first support face 432 and the second support face 433 may push thesupportive member 44 to overcome offsetting of the elastic member 45 tomove away from the hinge arm 43, such that the third support face 441may be switched from elastically abutting against one of the firstsupport face 432 and the second support face 433 to elastically abuttingagainst the other one of the first support face 432 and the secondsupport face 433.

In an embodiment, the supportive member 44 may be configured to connectto an end of the elastic member 45 facing towards the hinge arm 43, andmay enable the third support face 441 to face the hinge arm 43. When thehinge arm 43 is driven by an external force to rotate around the hingeshaft 41 relative to the hinge base 42, the third support face 441 maybe driven to enable the supportive member 44 to compress the elasticmember 45, and the supportive member 44 may further be offset by theelastic member 45. Of course, the supportive member 44 may not beconnected to the elastic member 45, but may abut against a side of theelastic member 45, with the proviso of the supportive member 44 able tobe offset.

The first support face 432 and the second support face 433 may be twoadjacent side faces of the hinge arm 43 being at least partiallyparallel to a central axis of the hinge shaft 41. Alternatively, thefirst support face 432 and the second support face 433 may be a portionof the two adjacent side faces. When the hinge arm 43 rotates relativeto the hinge base 42, the first support face 432 and the second face 433may rotate along with the hinge arm 43 around the hinge shaft 41, suchthat different side faces of the hinge arm 43 may face the hinge base42, such that the hinge arm 43 may have various relative positionrelationships with the hinge base 42.

In addition, the elastic member 45 may be an element able to provide anelastic force and able to be compressed along a direction of the elasticforce to provide a compression space. For example, the elastic member 45may be a spring. An end of the spring may abut against the supportivemember 44. When the third support face 441 of the supportive member 44is pushed by the elastic member 45, the elastic member 45 may resistagainst the supportive member 44 and may be compressed to provide aspace for the third support face 441 of the supportive member 44 along afacing direction of the third support face 441. In such a way, when arelative position of the hinge shaft 41 remains unchanged, a sufficientspace may be provided to enable different side faces of the hinge arm 43to rotate to reach a position between the hinge shaft 41 and the thirdsupport face 441.

To be specific, when the hinge arm 43 rotates relative to the hinge base42, the relative position of the hinge shaft 41 may not be changed, andthe contact position between the hinge arm 43 and the third support face441 of the hinge base 42 may be changed. As distances between variouspositions of the hinge arm 43 and the hinge shaft 41 may be various,when various positions of the hinge arm 43, such as various positions ofthe first support face 432 and the second support face 433, contact thethird support face 441, spaces required between the hinge shaft 41 and acontact point between the hinge arm 43 and the third support face 441may be various. Due to limitation of the elastic force and the space, aspace provided by compression of the elastic member 45 may be limited.Therefore, when the hinge arm 43 is rotating relative to the hinge base42, and when a distance between a position on a cross-sectional planeperpendicular to the central axis of the hinge shaft 41 and the hingeshaft 41 is excessively large, the position may be held on anotherposition on the third support face in the process of rotating, such thatthe hinge arm 43 may not rotate continually. In such a way, the hingearm 43 and the hinge base 42 may be rotate within a certain range only.In an embodiment, when the hinge arm 43 and the hinge base 42 arerotating relative to each other around the hinge shaft 41, only a regioncorresponding to the first support face 432 and the second support face433 and a region corresponding to the connective position 434 betweenthe first support face 432 and the second face 433 may abut against thethird support face 441.

Further, in the present embodiment, the first support face 432 and thesecond support face 433 may be flat. The hinge 40 may have tworelatively stable states. One of the two states may be the third supportface 441 abutting against the first support face 432, and the other oneof the two states may be the third support face 441 abutting against thesecond support face 433.

Of course, in the present embodiment, the first support face 432 and thesecond support face 433 may be curved faces having certain curvatures,or may include various sub-support faces, with the proviso of enablingthe hinge arm 43 and the hinge base 42 to correspondingly have at leasttwo relatively stable states, which will not be limited by the presentdisclosure. In addition, the hinge arm 43 may be arranged to have othersupport faces, such that when the hinge arm 43 is driven by the externalforce to rotate relative to the hinge base 42 around the hinge shaft 41,various support faces of the hinge arm 43 may elastically abut againstthe third support face 441, such that the hinge arm 43 and the hingebase 42 may have various relative position relationships, which will notbe limited by the present disclosure.

To be specific, an initial state being the first support face 432abutting against the third support face 441 of the supportive member 44may be taken as an example, as shown in FIGS. 32 and 33. Under such thesituation, the elastic member 45 may be elastically compressed anddeformed in the initial state, which will not be limited by the presentdisclosure. When the hinge 40 receives the external force to enable thehinge arm 43 to rotate relatively to the hinge base 42 around the hingeshaft 41 to allow the second support face 443 to move close to the thirdsupport face 441 gradually, the connective position 434 between thefirst support face 432 and the second support face 433 may contact thethird support face 441. As a distance between the connective position434 and the hinge shaft 41 is greater than a distance between the firstsupport face 432 and the hinge shaft 41, the connective position 434 mayabut against the supportive member 44 and drive the supportive member 44to move towards the elastic member 45, such that the elastic member 45may be compressed to resist a driving force. When the hinge arm 43further receives the external force, the connective position 434 maymove close to a region of the hinge shaft 41 gradually, and the regionmay be between the hinge shaft 41 and the third support face 441. In theabove-mentioned process, the distance between the hinge shaft 41 and thethird support face 441 may be gradually increased. It may be understoodthat, when a connection line between the connective position 434 and thehinge shaft 41 is perpendicular to the third support face 441, along thecross-sectional plane perpendicular to the central axis of the hingeshaft 41, the distance between the hinge shaft 41 and the third supportface 441 may be equal to the distance between the hinge shaft 41 and theconnective position 434. Under such the situation, the hinge shaft 41may be at a position having a greatest distance away from the thirdsupport face 441. When the hinge 40 further receives the external force,the distance between the hinge shaft 41 and the third support face 441may be gradually decreased, such that the space required by compressingthe elastic member 45 may be reduced, enabling the elastic member 45 torelease the elastic force gradually and to be restored gradually. Whenthe connective position 434 departs away from the third support face 441to enable the second support face 433 to abut against the third supportface 441, a switching from the first support face 432 abutting againstthe third support face 441 into the second support face 433 abuttingagainst the third support face 441 may be achieved.

Similarly, when the initial state is the second support face 433abutting against the third support face 441 of the supportive member 44,a process of switching from such the initial state to a state of thefirst support face 432 abutting against the third support face 441 ofthe supportive member 44 (as shown in FIGS. 35 and 36) may be similar tothe above description.

To be noted that, when the third support face 441 is switched fromabutting against one of the first support face 432 and the secondsupport face 433 into abutting against the other one of the firstsupport face 432 and the second support face 433, the hinge 40 may drivethe bone conductive speaker mechanism 20 and the body portion 321 toswitch between a first fixed relative position and a second fixedrelative position, and may enable the bone conductive speaker mechanism20 to adhere to and fit with the back of the auricle when the boneconductive speaker mechanism 20 and the body portion 321 are at thefirst fixed relative position.

In the present embodiment, the distance between the hinge shaft 41 andthe connective position 434 is greater than a vertical distance betweenthe hinge shaft 41 and the first support face 432 and a verticaldistance between the hinge shaft 41 and the second support face 433. Insuch a way, when switching from the third support face 441 abuttingagainst one of the first support face 432 and the second support face433 into the third support face 441 abutting against the other one ofthe first support face 432 and the second support face 433, a state ofthe hinge 40 may be changed promptly.

Taking switching from the first support face 432 abutting against thethird support face 441 into the second support face 433 abutting againstthe third support face 441 as an example, when a ratio of a maximumdistance h₁ between the hinge shaft 41 and the connective position 434to a minimum distance h₂ between the hinge shaft 41 and the firstsupport face 432 varies, an extent of the prompt change of the hinge 40in a process of switching may be varied.

In an embodiment, on the cross-sectional plane perpendicular to thecentral axis of the hinge shaft 41, the ratio of the maximum distance h₁between the hinge shaft 41 and the connective position 434 to theminimum distance h₂ between the hinge shaft 41 and the first supportface 432 may be in a range between 1.1 and 1.5.

To be specific, the hinge 41 may be configured at a position away fromthe second support face 433 and close to a side of the hinge arm 43opposing to the second support face 433. In such a way, the maximumdistance h₁ between the hinge shaft 41 and the connective position 434being greater than the minimum distance h₂ between the hinge shaft 41and the first support face 432 may be achieved, meeting theabove-mentioned criteria.

To be noted that, when the ratio of h₁ to h₂ is excessively large, theprompt change may be obvious, but a relatively large force may beapplied to switch from the first support face 432 abutting against thethird support face 441 into the second support face 433 abutting againstthe third support face 441, and it may be inconvenient to use thedevice. In the present embodiment, setting the ratio of h₁ to h₂ to bebetween 1.1 and 1.5 may enable the third support face 441 to be switchedfrom elastically abutting against the first support face 432 intoelastically abutting against the second support face 433, and the promptchange of the hinge 40 may be obvious. Therefore, when the device is inuse, the user may apparently feel the hinge 40 being pulled, and at thesame time, the prompt change may not be excessively abrupt such that theuser may have difficulty to switch states of the hinge 40.

In an embodiment, the ratio of h₁ to h₂ may be between 1.2 and 1.4. Tobe specific, the ratio of h₁ to h₂ may be 1.1, 1.2, 1.3, 1.4, 1.5, andthe like, which will not be limited by the present disclosure.

In addition, positions at which the first support face 432 and thesecond support face 433 are arranged on the hinge arm 43 may affect theangle between the hinge arm 43 and the hinge base 42 when the thirdsupport face 441 abuts against one of the first support face 432 and thesecond support face 433. Therefore, according to requirements of users,the first support face 432 and the second support face 433 may bearranged at various positions of the hinge arm 43. The angle between thehinge arm 43 and the hinge base 42 may be shown in FIGS. 32 and 35. Anangle ω₁ may be the angle between the hinge arm 43 and the hinge base 42when the third support face 441 abuts against the first support face432, and an angle ω₂ may be the angle between the hinge arm 43 and thehinge base 42 when the third support face 441 abuts against the secondsupport face 433. In an embodiment, each of the hinge arm 43 and thehinge base 42 may be in a certain length. The hinge arm 43 may beconfigured at an end of the hinge base 42 along the length direction ofthe hinge base 42. The first support face 432 may be arranged on an endof the hinge arm 43 close to the hinge base 42 along the lengthdirection of the hinge arm 43. The second support face 433 may bearranged on an end of the hinge arm 43 along a width direction of thehinge arm 43, and may extend parallelly to the central axis of the hingeshaft 41. Under such the situation, when the third support face 441elastically abuts against the first support face 432, the angle betweenthe hinge arm 43 and the hinge base 42 may reach a maximum. When thethird support face 441 elastically abuts against the second support face433, the angle between the hinge arm 43 and the hinge base 42 may reacha minimum. In such a way, when the third support face 441 elasticallyabutting against the first support face 432 is switched into the thirdsupport face 441 elastically abutting against the second support face433, the angle between the hinge base 42 and the hinge arm 12 may bedecreased from ω₁ to ω₃.

It may further be noted that, when the third support face 441elastically abutting against the first support face 432 is switched intothe third support face 441 elastically abutting against the secondsupport face 433, a direction of a force applied to the hinge arm 43 maybe consistent with a direction of gravity of the hinge arm 43. Switchingstates may enable the angle between the hinge base 42 and the hinge arm43 to decrease. In the present embodiment, the ratio of h₁ to h₂ may beset to prevent the angle between the bone conductive speaker mechanism20 and the hinge base 42 from being reduced caused by the gravity of thehinge arm 43 when the third support face elastically abuts against thefirst support face 432.

In an embodiment of the bone conductive sound generating device of thepresent disclosure, as shown in FIG. 34, on the cross-sectional planeperpendicular to the central axis of the hinge shaft 41, an angle ω₃between the first support face 432 and the second support face 433 maybe an obtuse angle.

When a state of the hinge 40 is switched by switching the third supportface 441 elastically abutting against the first support face 432 intothe third support face 441 elastically abutting against the secondsupport face 433, the smaller the ω₃ between the first support face 432and the second support face 433, the greater a relative rotational anglebetween the hinge base 42 and the hinge arm 43 may be required whileswitching states. In other words, when the hinge base 42 is fixed, theuser may need to rotate the hinge arm 43 for a relatively large angle toswitch the state of the hinge 40. Therefore, the user may apply agreater force, and the user may not be able to use the deviceconveniently.

As the hinge arm 43 may have a certain length, the first support face432 may be arranged on the end of the hinge arm 43 along the lengthdirection of the hinge arm 43, and the second support face 433 may bearranged adjacent to the first support face 432 and arranged along thewidth direction of the hinge arm 43. Typically, the first support face432 and the second support face 433 may be perpendicular to each other.When the hinge 40 is switched between the above-mentioned two states,the hinge arm 43 may be rotated for 90° relative to the hinge base 42.

In the present embodiment, on the cross-sectional plane perpendicular tothe hinge shaft 41, the angle ω₃ between the first support face 432 andthe second support face 433 may be an obtuse angle, such that when thehinge 40 is switched between the two states, the hinge arm 43 may berotated for less than 90° relative to the hinge base 42. To be specific,the hinge 40 may be configured to connect the body portion 321 with thebone conductive speaker mechanism 20. When the hinge 40 is in a secondstate of which the second support face 433 elastically abuts against thethird support face 441, the bone conductive speaker mechanism 20 and thebody portion 321 may be at the first fixed relative position, and thebone conductive speaker mechanism 20 may adhere to and fit with the backof the auricle. Therefore, when the user needs to use the boneconductive speaker mechanism 20, the bone conductive speaker mechanism20 may be required to rotate for less than 90° to adhere to and fit withthe back of the auricle. In addition, when the hinge 40 is in a firststate of which the first support face 432 elastically abuts against thethird support face 441, a certain angle may be defined between the hingearm 43 and the bone conductive speaker mechanism 20 connected thereto.Therefore, when the user is wearing the eyeglasses, the hinge arm 43 andthe connected bone conductive speaker mechanism 20 may be positioned atthe back and face towards the user's ears, such that the eyeglasses maybe held and fixed, and may not be fallen off from the user's headeasily.

To be noted that, the angle ω₃ between the first support face 432 andthe second support face 433 may be determined according to actualdemands. When the angle is excessively large, the angle between thehinge arm 43 and the hinge base 42 and an angle between the hinge base42 and a functional member 20 connected to the end of the hinge arm 43away from the hinge base 42 may be relatively small. Therefore, when theuser is wearing the device, the hinge arm 43 and the bone conductivespeaker mechanism 20 may be positioned excessively close to the user'sears and compress the ears, and the user may feel uncomfortable. Whenthe angle is excessively small, according to one aspect, the user needto drive the bone conductive speaker mechanism 20 for an excessivelylarge angle when driving the bone conductive speaker mechanism 20 tomove from the first relative position to the second relative position,and it may be inconvenient for the user to use the device; and accordingto another aspect, the angle between the body portion 321 and boneconductive speaker mechanism 20 and the angle between the hinge 40 andthe bone conductive speaker mechanism 20 may be relatively small, andthe eyeglasses may not be held or fixed. Therefore, when the user iswearing the eyeglasses, the eyeglasses may be fallen off from the frontof the user's head easily. To be specific, the angle between the firstsupport face 432 and the second support face 433 may be determined basedon the head shape of the user.

To be specific, in an embodiment, on the cross-sectional planeperpendicular to the central axis of the hinge shaft 41, the angle ω₃between the first support face 432 and the second support face 433 maybe between 100° and 120°, and may specifically be 100°, 110°, 120°, andthe like. Based on the determined angle, when the user is wearing theeyeglasses and sets the bone conductive speaker mechanism 20 at thefirst fixed relative position relative to the body portion 321, the boneconductive speaker mechanism 20 may not be excessively close to theuser's ears to cause any uncomfortable feeling. When switching the boneconductive speaker mechanism 20 between the two relative positionsrelative to the body portion 321, the hinge may not be rotated by anexcessively large angle, such that the user may use the deviceconveniently.

When the third support face 441 elastically abutting against one of thefirst support face 432 and the second support face 433 is switched intothe third support face 441 elastically abutting against the other one ofthe first support face 432 and the second support face 433, theconnective position 434 between the first support face 432 and thesecond support face 433 may abut against the third support face 441, andthe supportive member 44 may be driven to resist against the elasticoffsetting applied by the elastic member 45 and move away from the hingearm 43. Taking the third support face 441 elastically abutting againstthe first support face 432 before the state switching as an example,when the state switching is initialized, the first support face 432 maydepart away from the third support face 441 gradually, and at the sametime, the connective position 434 abuts against the third support face441 gradually. When the state is switching, the connective position 434may slide from a side of the third support face 441 to another side ofthe third support face 441. At last, the state may be transitioned intothe second support face 433 elastically abutting against the thirdsupport face 441. When the state is switching, the connective position434 may abut against the third support face 441 mutually at all time,and a shape of the connective position 434 may affect a process of stateswitching. For example, when the first support face 432 and the secondsupport face 433 are connected through a line, the connective position434 may have a relatively sharp corner. When the user drive the hingebase 42 and/or the hinge arm 43 to switch states for the hinge 40,according to one aspect, a relatively low level of buffer may be appliedto switching from the connective position 434 abutting against the thirdsupport face 441 into the connective position 434 abutting against thefirst support face 432 and the second support face 433, and the stateswitching may be abrupt, user may have an unideal feeling about drivingthe hinge 40; and according to another aspect, the connective position434 may be relatively sharp, and the third support face 441 may beabraded after the state switching being repeatedly performed.

In an embodiment of the present disclosure, on the cross-sectional planeperpendicular to the central axis of the hinge shaft 41, the connectiveposition 434 may be curved, such that the first support face 432 and thesecond support face 433 may be connected through a curved face. When astate of the hinge 40 is being switched, the connective position 434abutting against the third support face 441 may be relatively smooth,such that the user may have an ideal feeling about driving the hinge 40,and the abrasion of the third support face 441 may be reduced after thestate switching being repeatedly performed.

To be specific, in an embodiment, the connective position 434 may beconfigured to be an arc having varied curvatures, which may generatevarious effects. A value of a curvature may be determined based onactual needs. In the present embodiment, the curvature of the arc may beset to be in a range of 5 to 30, and may specifically be 5, 10, 15, 20,25, 30, and the like, which will not be limited to the presentdisclosure.

To be noted that, in the present embodiment, the curvature of arc of theconnective position 434 may enable the user to have a satisfied feelingwhen driving the hinge 40 to allow the bone conductive speaker mechanism20 to switch between the first fixed relative position and the secondfixed relative position relative to the body portion 321.

In an embodiment, the third support face 441 may be configured torequire different forces to switch from the third support face 441elastically abutting against the first support face 432 into the thirdsupport face 441 elastically abutting against the second support face433 and to switch from the third support face 441 elastically abuttingagainst the second support face 433 to the third support face 441elastically abutting against the first support face 432.

To be noted that, switching states of the hinge 40 may drive the boneconductive speaker mechanism 20 to switch between the first fixedrelative position relative to the body portion 321 and the second fixedrelative position relative to the body portion 321. Correspondingly, thetwo fixed relative positions may correspond to the bone conductivespeaker mechanism 20 being in use and the bone conductive speakermechanism 20 being not in use respectively. When the user is wearing theeyeglasses, difficulty of a user's hand applying a force at a back ofthe head to switch the first fixed relative position into the secondfixed relative position is difference from difficulty of the user's handapplying the force at the back of the head to switch the second relativeposition into the first fixed relative position. Therefore, the deviceis configured to require different external forces corresponding toswitching between different states, allowing the user to use the deviceeasily.

To be specific, in an embodiment, the third support face 441 elasticallyabutting against the first support face 432 being switched into thethird support face 441 elastically abutting against the second supportface 433 may correspond to the bone conductive speaker mechanism 20 atthe second fixed relative position relative to the body portion 321being switched into the bone conductive speaker mechanism 20 at thefirst fixed relative position relative to the body portion 321 to adhereto and fit with the back of the auricle.

Further, in the present embodiment, the external force applied to thethird support face 441 to enable the third support face 441 elasticallyabutting against the first support face 432 to be switched into thethird support face 441 elastically abutting against the second supportface 433 may be less than the external force applied to the thirdsupport face 441 to enable the third support face 441 elasticallyabutting against the second support face 433 to be switched into thethird support face 441 elastically abutting against the first supportface 432.

When using the bone conductive speaker mechanism 20, the third supportface 441 elastically abutting against the first support face 432 may berequired to be switched into the third support face 441 elasticallyabutting against the second support face 433. When the bone conductivespeaker mechanism 20 is not in use, the third support face 441elastically abutting against the second support face 433 may be requiredto be switched into the third support face 441 elastically abuttingagainst the first support face 432. According to the present embodiment,the force that the user may apply to allow the bone conductive speakermechanism 20 to be in use is less than the force that the user may applyto allow the bone conductive speaker mechanism 20 to be not in use.Therefore, it may be convenient for the user to use functions of thebone conductive speaker mechanism 20.

To be specific, further referring to FIGS. 34 and 36, in an embodiment,when the third support face 441 elastically abutting against the firstsupport face 432 is switched into the third support face 441 elasticallyabutting against the second support face 433, the connective position434 may initially contact a first position 4411 of the third supportface 441. When the third support face 441 elastically abutting againstthe second support face 433 is switched into the third support face 441elastically abutting against the first support face 432, the connectiveposition 434 may contact a second position 4412 of the third supportface 441. On the cross-sectional plane perpendicular to the central axisof the hinge shaft 41, a contact point may be defined between theelastic member 45 and the supportive member 44, and a distance d₁between the first position 4411 and the contact point along an elasticoffsetting direction of the elastic member 45 may be less than adistance d₂ between the second position 4412 and the contact point alongthe elastic offsetting direction.

To be noted that, when the third support face 441 elastically abutsagainst the first support face 432, the connective position 434 may bearranged at a position close to an end of the third support face 441.When the third supportive face 441 elastically abuts against the secondsupport face 443, the connective position 434 may be arranged at aposition close to another end of the third support face 441. Therefore,the first position 4411 and the second position 4412 may be at two endsof the third support face 441. In other words, in the presentembodiment, a distance between a position close to the end of the thirdsupport face 441 of the supportive member 44 and the contact point maybe different from a distance between a position close to another end ofthe third support face 441 of the supportive member 44 and the contactpoint along the elastic offsetting direction of the elastic member 45,and the distance corresponding to the second position 4412 may be lessthan the distance corresponding to the first position 4411. Under suchthe situation, when the third support face 441 elastically abuttingagainst the first support face 432 is switched into the third supportface 441 elastically abutting against the second support face 433, theconnective position 434 may not initially abut against the third supportface 441 and may not receive the elastic force applied from the elasticmember 45, but may gradually abut against the third support face 441 andgradually receive the elastic force applied from the elastic member 45.When the third support face 441 elastically abutting against the firstsupport face 432 is switched into the third support face 441 elasticallyabutting against the second support face 433, the connective position434 may initially abut against the third support face 441 and receivethe elastic force applied by the elastic member 45. Alternatively, evenwhen comparing to the third support face 441 elastically abuttingagainst the second support face 433 being switched into the thirdsupport face 441 elastically abutting against the first support face432, the connective position 434 may receive the elastic force appliedfrom the elastic member 45 at an earlier stage when the third supportface 441 elastically abutting against the first support face 432 isswitched into the third support face 441 elastically abutting againstthe second support face 433. Therefore, under such the situation, arelatively small force may be required to switch the hinge 40elastically abutting against the first support face 432 into the hinge40 elastically abutting against the second support face 433. In such away, when the user is using the bone conductive speaker mechanism 20,the user may apply a relatively small force to drive the bone conductivespeaker mechanism 20, and it may be convenient for the user to use thedevice.

Further, the third support face 441 may include a first sub-support face4413 and a second sub-support face 4414. The first position 4411 may bedefined on the first sub-support face 4413, and the second position 4412may be defined on the second sub-support face 4414. That is, the firstsub-support face 4413 and the second sub-support face 4414 may bearranged close to the two ends of the third support face 441.

The second sub-support face 4414 may be a flat face. To be specific,when the first support face 432 or the second support face 433elastically abuts against the third support face 441, the secondsub-support face 4414 may be parallel to the first support face 432 orthe second support face 433. The first sub-support face may be a flatface or a curved face, which will not be limited by the presentdisclosure.

Further, the first sub-support face 4413 and the second sub-support face4414 may not be arranged on a same plane. The first sub-support face4413 may be inclined to the second sub-support face 4414, and an anglebetween the first sub-support face 4413 and the second sub-support face4414 may be less than or equal to 10°, such as may be less than or equalto 2°, 4°, 6°, 8°, 10°, and the like. To be specific, the firstsub-support face 4413 may be arranged to face a direction away from thehinge arm 43, such that, on the cross-sectional plane perpendicular tothe central axis of the hinge shaft 41, the distance between the firstposition 4411 and the contact point between the elastic member 45 andthe supportive member 44 along the elastic offsetting direction of theelastic member 45 may be less than the distance between the secondposition 4412 and the contact point along the elastic offsettingdirection. When the first sub-support face 4413 is the curved, and thesecond sub-support face 4414 is the flat, the angle between the firstsub-support face 4413 and the second sub-support face 4414 may be anangle between a plane tangent to the first sub-support face 4413 and thesecond sub-support face 4414 at an intersection between the firstsub-support face 4413 and the second sub-support face 4414.

Further referring to FIG. 37, in an embodiment, the hinge base 42 mayinclude a base body 423, a fourth ledge 424, and a fifth ledge 425. Thefourth ledge 424 and the fifth ledge 425 may protrude from the base body423 and may be spaced apart from each other. That is, a gap may bedefined between the fourth ledge 424 and the fifth ledge 425. The hingearm 43 may include an arm body 435 and a sixth ledge 436 protruding fromthe arm body 435. The sixth ledge 436 may be inserted into the gap, andmay be rotatably connected to the fourth ledge 424 and the fifth ledge425 through the hinge shaft 41. The first support face 432 and thesecond support face 433 may be arranged on the sixth ledge 436. Thesupportive member 44 may be at least partially received in the gap andmay be arranged on a side of the sixth ledge 436 facing the base body423. The base body 423 may define a receiving chamber 4231 fluidlycoupled to the gap. The elastic member 45 may be received in thereceiving chamber 4231, and may offset the supportive member 44 towardsthe sixth ledge 436.

To be specific, a first through hole, a second through hole, and a thirdthrough hole may be defined in the fourth ledge 424, the fifth ledge425, and the sixth ledge 436, and the first through hole, the secondthrough hole, and the third through hole may extend along a same axialdirection. An inner diameter of each of the three through holes may begreater than or equal to the outer diameter of the hinge shaft 41, suchthat when the hinge shaft 41 is inserted and extends through the throughholes, the hinge base 42 arranged with the fourth ledge 424 and thefifth ledge 425 may be rotatably connected to the hinge arm 43 arrangedwith the sixth ledge 436.

The first support face 432 and the second support face 433 are arrangedon the sixth ledge 436 and parallel to the central axis of the hingeshaft 41, such that when the hinge arm 43 rotates relative to the hingebase 42 around the hinge shaft 41, the first support face 432 and thesecond support face 433 may be received in the gap between the fourthledge 424 and the fifth ledge 425.

Further, the supportive member 44 may be positioned between the fourthledge 424 and the fifth ledge 425 of the base body 423, and the thirdsupport face 441 of the supportive member 44 may be arranged to facetowards the sixth ledge 436, in an embodiment, the elastic member 45 maybe completely received in the receiving chamber 4231, and a side of theelastic member 45 facing the gap between the fourth ledge 424 and thefifth ledge 425 may contact the supportive member 44. When the elasticmember 45 is in a natural state, a region of the supportive member 44close to the elastic member 45 may be at least partially received in thereceiving chamber 4231, To be noted that, a portion of the supportivemember 44 received in the receiving chamber 4231 may have a shapefitting with the receiving chamber 4231. Therefore, when the elasticmember 45 elastically offset the supportive member 44, the portion ofthe supportive member 44 received in the receiving chamber 4231 maystably slide along and inside the receiving chamber 4231.

In an embodiment, on the cross-sectional plane perpendicular to thehinge base 42, an area of a cross section of the receiving chamber 4231taken along the cross-sectional plane may be less than an area of across section of the gap between the fourth ledge 424 and the fifthledge 425 taken along the cross-sectional plane. A shape of a portion ofthe supportive member 44 arranged out of the receiving chamber 4231 mayfit with the gap between the fourth ledge 424 and the fifth ledge 425.In such a way, when the supportive member 44 moves towards the elasticmember 45, the supportive member 44 may not be completely received intothe receiving chamber 4231.

Of course, in other embodiments, on the cross-sectional planeperpendicular to the hinge base 42, a shape of the cross section of thereceiving chamber 4231 taken along the cross-sectional plane may be thesame as a shape of the cross section of the gap between the fourth ledge424 and the fifth ledge 425 taken along the cross-sectional plane. Undersuch the situation, the supportive member 44 may be completely receivedin the receiving chamber 4231, such that the supportive member 44 mayslide along and inside the receiving chamber 4231 when the supportivemember 44 is being pushed.

Further, the first end face 422 of the hinge base 42 may be an end faceof the fourth ledge 424 and the fifth ledge 425 facing towards the hingearm 43. The sixth ledge 436 arranged on and protrude from the arm body435 may be received in the gap between the fourth ledge 424 and thefifth ledge 425, such that the first end face 422 of the fourth ledge424 and the fifth ledge 425 may be arranged to face the arm body 435. Onthe cross-sectional plane perpendicular to the central axis of the hingeshaft 41, a second end face 431 may be arranged on the arm body 435protruding from the sixth ledge 436 and facing the fourth ledge 424 andthe fifth ledge 425 of the hinge base 42.

In the present embodiment, when the hinge arm 43 and the hinge base 42rotating relative to each other, a gap between the first end face 422 ofthe fourth ledge 424 and the fifth ledge 425 and the second end face 431of the arm body 435 may be greater than or less than the diameter of thesecond connection thread 60 at all time. In such a way, the secondconnection thread 60 may not be clamped between the arm body 435 and thefourth ledge 424 or between the arm body 435 and the fifth ledge 425when the hinge base 42 and the hinge arm 43 rotate relative to eachother, reducing a damage to the second connection thread 60 caused bythe hinge 40.

In an embodiment, the gap between the first end face 422 of the arm body435 and the second end face 431 of the fourth ledge 424 and the fifthledge 425 may always be significantly greater than or significantly lessthan the diameter of the second connection thread 60 when the hinge arm43 and the hinge base 42 are rotating relative to each other, such thatthe damage to the second connection thread 60 caused by the hinge 40 mayfurther be reduced.

To be noted that, in the present embodiment, the gap between the firstend face 422 and the second end face 431 may be even and have a uniformsize to satisfy the above-mentioned condition of the gap being greaterthan or less than the diameter of the second connection thread 60.Alternatively, in another embodiment, a gap between a region of thefirst end face close to the second connection thread 60 and a region ofthe second end face close to the second connection thread 60 may begreater than or less than the diameter of the second connection thread60, and other regions of the first and the second end faces may not berequired to meet the above-mentioned condition.

To be specific, in an embodiment, on the cross-sectional planeperpendicular to the central axis of the hinge shaft 41, at least one ofthe end face of the fourth ledge 424 and the fifth ledge 425 facing thehinge arm 43 and the end face of the arm body 435 facing the hinge base42 may be chamfered, such that when the hinge arm 43 and the hinge base42 are rotating relative to each other, a region of the gap therebetweenclose to the second connection thread 60 may be greater than thediameter of the second connection thread 60 at all time.

Chamfering the end faces may generate a round corner or may cut the endfaces directly.

In the present application scenario, at least one of the end face of thefourth ledge 424 and the fifth ledge 425 facing the hinge arm 43 and theend face of the arm body 435 facing the hinge base 42 may be chamfered,such that when the hinge arm 43 and the hinge base 42 are rotatingrelative to each other, the second connection thread 60 may not beclamped into the gap between the two end faces.

The above description may only be embodiments of the present disclosure,without limiting the scope of the present disclosure. Any equivalentstructural or process transformation performed based on thespecification and the drawings of the present disclosure, applieddirectly or indirectly in other related art, should also be includedwithin the scope of the present disclosure.

What is claimed is:
 1. A bone conductive sound generating device,comprising: a fixing mechanism comprising a rim, a first arm, and asecond arm, wherein the first arm and the second arm are connected totwo opposite sides of the rim; a first bone conductive speakermechanism, connected to an end of the first arm away from the rim; and afirst connection member, configured to connect the first bone conductivespeaker mechanism to the first arm such that the first bone conductivespeaker mechanism is capable of moving from a first fixed positionrelative to the first arm to a second fixed position relative to thefirst arm through the first connection member; wherein when the firstbone conductive speaker mechanism is in the first fixed positionrelative to the first arm, a first angle is defined between the firstbone conductive speaker mechanism and the first arm; and when the firstbone conductive speaker mechanism is in the second fixed positionrelative to the first arm, a second angle is defined between the firstbone conductive speaker mechanism and the first arm, wherein the firstangle is less than the second angle, wherein the bone conductive soundgenerating device further comprises a first hinge configured to connectthe end of the first arm away from the rim with the first connectionmember, the first hinge comprises: a first hinge base, connected to theend of the first arm away from the rim; a first hinge shaft; a firsthinge arm, wherein an end of the first hinge arm is rotatably connectedto the first hinge base through the first hinge shaft the other end ofthe first hinge arm is connected to an end of the first connectionmember away from the first bone conductive speaker mechanism, such thatthe first connection member and the first bone conductive speakermechanism is rotatable relative to the first arm to allow the first boneconductive speaker mechanism to be arranged at the first fixed positionor the second fixed position relative to the first arm; and a supportivemember and an elastic member, wherein the supportive member is movablyarranged with the first hinge base, the elastic member is configured toapply an elastic force to the supportive member to elastically offsetthe supportive member towards the first hinge arm.
 2. The boneconductive sound generating device according to claim 1, wherein thefirst bone conductive speaker mechanism comprises a fitting face; thefitting face comprises a protruded curved face configured to adhere toand fit with a predefined region of a back of an auricle of a user, acurvature of the curved face is less than or equal to 1, an area of thecurved face is less than or equal to 0.5 cm² or 1.0 cm², and a center ofthe predefined region of the back of the auricle faces directly a crusof helix.
 3. The bone conductive sound generating device according toclaim 1, further comprising a second connection member, wherein thefirst arm comprises a first body portion, arranged between and connectedwith the rim and the first connection member, the second arm comprises asecond body portion, arranged between and connected with the rim and thesecond connection member; a top surface of the first body portion and atop surface of the second body portion are on a reference horizontalplane; the first connection member comprises a first portion and asecond portion, the first portion and the second portion are symmetricalabout a symmetrical plane; the rim comprises a first sub-rim and asecond sub-rim, the first sub-rim and the second sub-rim are symmetricalabout a rim symmetrical plane; an angle between the symmetrical planeand the reference horizontal plane is in a range of 65° to 85° when thefirst bone conductive speaker mechanism is in the first fixed positionrelative to the first arm; and an angle between the symmetrical planeand a rim symmetrical plane is in a range of 5° to 30° when the firstbone conductive speaker mechanism is in the first fixed positionrelative to the first arm.
 4. The bone conductive sound generatingdevice according to claim 1, wherein the first arm defines a firstchamber, and a functional component is received in the first chamber,the second arm defines a second chamber, and another functionalcomponent is received in the second chamber, and the bone conductivesound generating device further comprises: a first connection thread,configured to electrically connect the functional component received inthe first arm and the another functional component received in thesecond arm; and a rotational shaft assembly, configured to connect therim with the first arm, wherein the rotational shaft assembly comprisesa first rotational shaft, an end of the first rotational shaft isfixedly connected to one of the rim and the first arm, the other end ofthe first rotational shaft is rotatably connected to the other one ofthe rim and the first arm, such that the rim and the first arm arerotatable relative to each other around the rotational shaft assembly;the first rotational shaft defines a thread channel along an axialdirection of the first rotational shaft, two end faces of the firstrotational shaft define two thread openings being fluidly coupled to anexternal environment, the thread channel is defined to be fluidlycoupled to the two thread openings to further be fluidly coupled to theexternal environment; and the first connection thread is received in thethread channel, an end of the first connection thread extends along thethread channel to reach the rim through one of the two thread openings,and the other end of the first connection thread extends along thethread channel to reach the first arm through the other one of the twothread openings.
 5. The bone conductive sound generating deviceaccording to claim 4, wherein the rotational shaft assembly furthercomprises a second rotational shaft, the second rotational shaft isconfigured spaced apart from the first rotational shaft, the first andthe second rotational shafts are coaxial; the rim comprises a firstledge; the first arm comprises a second ledge and a third ledge, thesecond ledge and the third ledge are configured at an end of the firstarm close to the rim and are spaced apart from each other; an end of thefirst rotational shaft close to the second rotational shaft and an endof the second rotational shaft close to the first rotational shaft areconnected to two opposite ends of the first ledge, an end of the firstrotational shaft away from the second rotational shaft is connected tothe second ledge, and an end of the second rotational shaft away fromthe first rotational shaft is connected to the third ledge, such thatthe first ledge is configured between the second ledge and the thirdledge.
 6. The bone conductive sound generating device according to claim5, wherein the two thread openings comprise: a first thread opening,defined on an end face of the first rotational shaft close to the secondrotational shaft; and a second thread opening, defined on a side wall ofthe first rotational shaft close to the second ledge, wherein the firstrotational shaft is rotatably connected to the first ledge through theend face defining the first thread opening and fixedly connected to thesecond ledge through the side wall defining the second thread opening.7. The bone conductive sound generating device according to claim 5,wherein the first ledge defines a first receiving hole, the second ledgedefines a second receiving hole, the first receiving hole and the secondreceiving hole are coaxial; the first rotational shaft is configured tobe received in the first receiving hole and the second receiving hole;and an outer wall of the first rotational shaft has an interference fitwith an inner wall of the second receiving hole, and a gap is definedbetween the outer wall of the first rotational shaft and an inner wallof the first receiving hole.
 8. The bone conductive sound generatingdevice according to claim 5, wherein the first ledge defines a thirdreceiving hole, the third ledge defines a fourth receiving hole, thethird receiving hole and the fourth receiving hole are coaxial; thesecond rotational shaft is configured to be received in the thirdreceiving hole and the fourth receiving hole; and an outer wall of thesecond rotational shaft has an interference fit with an inner wall ofthe third receiving hole, and a gap is defined between the outer wall ofthe second rotational shaft and an inner wall of the fourth receivinghole, or has an interference fit with the inner wall of the fourthreceiving hole, and a gap is defined between the outer wall of thesecond rotational shaft and the inner wall of the third receiving hole.9. The bone conductive sound generating device according to claim 1,further comprising a second hinge, wherein the second hinge isconfigured to connect to the second arm and comprises a second hingeshaft; the first hinge shaft has a first central point, the second hingeshaft has a second central point, and a hinge shaft connection line isdefined between the first central point and the second central point; aratio of a distance between the first central point and a central pointof the fitting face to a vertical distance between a symmetrical centralpoint of the rim and the hinge shaft connection line is in a range of0.1 to 1.5.
 10. The bone conductive sound generating device according toclaim 1, wherein the first hinge arm comprises a first support face anda second support face, arranged at an end of the first hinge arm closeto the first hinge base, and the first support face and the secondsupport face are adjacent to each other; the supportive member comprisesa third support face, wherein when the first bone conductive speakermechanism is in the first fixed position relative to the first arm, thesecond support face is configured to elastically abut against the thirdsupport face, and the first bone conductive speaker mechanism isconfigured to adhere to and fit with the back of the auricle; the firstsupport face is configured to elastically abut against the third supportface when the first bone conductive speaker mechanism is in the secondfixed position relative to the first arm; and when the first boneconductive speaker mechanism is transitioned between the first fixedposition and the second fixed position relative to the first arm, aconnective position between the first support face and the secondsupport face is configured to elastically abut against the third supportface to resist against the elastic force applied by the elastic member.11. The bone conductive sound generating device according to claim 10,wherein a cross-sectional plane of the first hinge shaft isperpendicular to a central axis of the first hinge shaft; and a ratio ofa maximum distance between the first hinge shaft and the connectiveposition on the cross-sectional plane to a minimum distance between thefirst hinge shaft and the first support face is in a range of 1.1 to1.5.
 12. The bone conductive sound generating device according to claim1, further comprising: a second bone conductive speaker mechanism,connected to an end of the second arm away from the rim; and a secondconnection member, configured to connect the second bone conductivespeaker mechanism to the second arm such that the second bone conductivespeaker mechanism is capable of moving from a first fixed positionrelative to the second arm to a second fixed position relative to thesecond arm through the second connection member; wherein when the secondbone conductive speaker mechanism is in the first fixed positionrelative to the second arm, a third angle is defined between the secondbone conductive speaker mechanism and the second arm; and when thesecond bone conductive speaker mechanism is in the second fixed positionrelative to the second arm, a fourth angle is defined between the secondbone conductive speaker mechanism and the second arm, wherein the thirdangle is less than the fourth angle.
 13. A head-mounted earphone,comprising: a frame, comprising a rim, a first arm, a second arm, and arotational assembly, wherein the rotational assembly is configured toconnect the first arm and the second arm to two opposite ends of therim; a first speaker assembly, comprising a first connection member anda first speaker mechanism connected with each other; a second speakerassembly, comprising a second connection member and a second speakermechanism connected with each other; a first hinge, configured toconnect an end of the first connection member away from the firstspeaker mechanism to an end of the first arm away from the rim; and asecond hinge, configured to connect an end of the second connectionmember away from the second speaker mechanism to an end of the secondarm away from the rim, wherein a distance between the end of the firstconnection member away from the first speaker mechanism and the end ofthe first arm away from the rim is adjustable via the first hinge; whenthe first hinge is in a first state, the first speaker mechanism is in afirst fixed position relative to the first arm, and a first distance isdefined between the end of the first connection member away from thefirst speaker mechanism and the end of the first arm away from the rim;when the first hinge is in a second state, the first speaker mechanismis in a second fixed position relative to the first arm, and a seconddistance is defined between the end of the first connection member awayfrom the first speaker mechanism and the end of the first arm away fromthe rim, wherein the first distance is less than the second distance,and wherein the first hinge comprises: a first hinge base, connected tothe end of the first arm away from the rim; a first hinge shaft; a firsthinge arm, wherein an end of the first hinge arm is rotatably connectedto the first hinge base through the first hinge shaft the other end ofthe first hinge arm is connected to an end of the first connectionmember away from the first bone conductive speaker mechanism, such thatthe first connection member and the first bone conductive speakermechanism is rotatable relative to the first arm to allow the first boneconductive speaker mechanism to be arranged at the first fixed positionor the second fixed position relative to the first arm; and a supportivemember and an elastic member, wherein the supportive member is movablyarranged with the first hinge base, the elastic member is configured toapply an elastic force to the supportive member to elastically offsetthe supportive member towards the first hinge arm.
 14. The head-mountedearphone according to claim 13, wherein the first arm comprises a firstbody portion, arranged between and connected with the rim and the firstconnection member, the second arm comprises a second body portion,arranged between and connected with the rim and the second connectionmember; a top surface of the first body portion and a top surface of thesecond body portion are on a reference horizontal plane; the firstconnection member comprises a first portion and a second portion, thefirst portion and the second portion are symmetrical about a symmetricalplane; the rim comprises a first sub-rim and a second sub-rim, the firstsub-rim and the second sub-rim are symmetrical about a rim symmetricalplane; an angle between the symmetrical plane and the referencehorizontal plane is in a range of 65° to 85° when the first speakermechanism is in the first fixed position relative to the first arm; andan angle between the symmetrical plane and the rim symmetrical plane isin a range of 5° to 30° when the first speaker mechanism is in the firstfixed position relative to the first arm.
 15. The head-mounted earphoneaccording to claim 13, wherein the first arm defines a first chamber,and a functional component is received in the first chamber, the secondarm defines a second chamber, and another functional component isreceived in the second chamber, and the head-mounted earphone furthercomprises a first connection thread configured to electrically connectthe functional component received in the first arm and the anotherfunctional component received in the second arm; and the rotationalshaft assembly comprises a first rotational shaft, an end of the firstrotational shaft is fixedly connected to one of the rim and the firstarm, the other end of the first rotational shaft is rotatably connectedto the other one of the rim and the first arm, such that the rim and thefirst arm are rotatable relative to each other around the rotationalshaft assembly; the first rotational shaft defines a thread channelalong an axial direction of the first rotational shaft, two end faces ofthe first rotational shaft define two thread openings being fluidlycoupled to an external environment, the thread channel is defined to befluidly coupled to the two thread openings to further be fluidly coupledto the external environment; and the first connection thread is receivedin the thread channel, an end of the first connection thread extendsalong the thread channel to reach the rim through one of the two threadopenings, and the other end of the first connection thread extends alongthe thread channel to reach the first arm through the other one of thetwo thread openings.
 16. The head-mounted earphone according to claim13, wherein the first hinge arm comprises a first support face and asecond support face, arranged at an end of the first hinge arm close tothe first hinge base, and the first support face and the second supportface are adjacent to each other; the supportive member comprises a thirdsupport face, wherein the second support face is configured toelastically abut against the third support face when the first speakermechanism is in the first fixed position relative to the first arm, andthe first speaker mechanism is configured to adhere to and fit with aback of an auricle when the first bone conductive speaker mechanism isin the first fixed relative position relative to the first arm; thefirst support face is configured to elastically abut against the thirdsupport face when the first speaker mechanism is in the second fixedposition relative to the first arm; and when the first bone conductivespeaker mechanism is transitioned between the first fixed position andthe second fixed position relative to the first arm, a connectiveposition between the first support face and the second support face isconfigured to elastically abut against the third support face to resistagainst the elastic force applied by the elastic member.
 17. Thehead-mounted earphone according to claim 16, wherein the first hingeshaft has a cross-sectional plane perpendicular to a central axis of thefirst hinge shaft; and a ratio of a maximum distance between the firsthinge shaft and the connective position on the cross-sectional plane toa minimum distance between the first hinge shaft and the first supportface is in a range of 1.1 to 1.5.
 18. A bone conductive speakerassembly, comprising: a connection member and a bone conductive speakermechanism, wherein an end of the connection member is connected to thebone conductive speaker mechanism, the other end of the connectionmember is capable of being electrically connected to an end of an arm ofeyeglasses; the bone conductive speaker mechanism has a protruded curvedface, the protruded curved face is capable of adhering to and fittingwith a predefined region of a back of an auricle of an ear; and a centerof the predefined region directly faces a crus of helix of the ear,wherein the bone conductive speaker assembly further comprises a firsthinge configured to connect the end of the arm with the first connectionmember, the first hinge comprises: a first hinge base, connected to theend of the first; a first hinge shaft; a first hinge arm, wherein an endof the first hinge arm is rotatably connected to the first hinge basethrough the first hinge shaft the other end of the first hinge arm isconnected to an end of the first connection member away from the firstbone conductive speaker assembly, such that the first connection memberand the first bone conductive speaker assembly is rotatable relative tothe first arm to allow the first bone conductive speaker mechanism to bearranged at the first fixed position or the second fixed positionrelative to the first arm; and a supportive member and an elasticmember, wherein the supportive member is movably arranged with the firsthinge base, the elastic member is configured to apply an elastic forceto the supportive member to elastically offset the supportive membertowards the first hinge arm.